[clangd] Split tweak tests into one file per tweak.

[adamcz]

Summary

No changes to the tests themselves, other than some auto -> const auto
diagnostic fixes and formatting.

[adamcz]

sorted CMake file

[sammccall]

clang-tools-extra/clangd/unittests/tweaks/AnnotateHighlightingsTests.cpp

10

Most of these headers are unused in most of the tests, not sure what's the best point to clean them up

Most of these should just need TweakTests, gmock and gtest.

[adamcz]

Removed unused incldues and usings

[adamcz]

rebase

clang-tools-extra/clangd/unittests/CMakeLists.txt

add_unittest(ClangdUnitTests ClangdTests
   SymbolInfoTests.cpp
   SyncAPI.cpp
   TUSchedulerTests.cpp
   TestFS.cpp
   TestIndex.cpp
   TestTU.cpp
   TestWorkspace.cpp
   TypeHierarchyTests.cpp
-  TweakTests.cpp
-  TweakTesting.cpp
   URITests.cpp
   XRefsTests.cpp
   ${CMAKE_CURRENT_BINARY_DIR}/DecisionForestRuntimeTest.cpp
 
   support/CancellationTests.cpp
   support/ContextTests.cpp
   support/FunctionTests.cpp
   support/MarkupTests.cpp
   support/MemoryTreeTests.cpp
   support/ThreadingTests.cpp
   support/TestTracer.cpp
   support/TraceTests.cpp
 
+  tweaks/TweakTests.cpp
+  tweaks/TweakTesting.cpp
+  tweaks/PopulateSwitchTests.cpp
+  tweaks/AddUsingTests.cpp
+  tweaks/DefineOutlineTests.cpp
+  tweaks/DefineInlineTests.cpp
+  tweaks/RemoveUsingNamespaceTests.cpp
+  tweaks/ExtractFunctionTests.cpp
+  tweaks/ExtractVariableTests.cpp
+  tweaks/SwapIfBranchesTests.cpp
+  tweaks/RawStringLiteralTests.cpp
+  tweaks/ObjCLocalizeStringLiteralTests.cpp
+  tweaks/DumpASTTests.cpp
+  tweaks/ExpandMacroTests.cpp
+  tweaks/ExpandAutoTypeTests.cpp
+  tweaks/DumpSymbolTests.cpp
+  tweaks/DumpRecordLayoutTests.cpp
+  tweaks/AnnotateHighlightingsTests.cpp
+  tweaks/ShowSelectionTreeTests.cpp
+
   ${REMOTE_TEST_SOURCES}
 
   $<TARGET_OBJECTS:obj.clangDaemonTweaks>
   )
 
 # Include generated ComletionModel headers.
 target_include_directories(ClangdTests PUBLIC
   $<BUILD_INTERFACE:${CMAKE_CURRENT_BINARY_DIR}>

clang-tools-extra/clangd/unittests/TweakTests.cpp

-//===-- TweakTests.cpp ------------------------------------------*- C++ -*-===//
-//
-// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-// See https://llvm.org/LICENSE.txt for license information.
-// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
-//
-//===----------------------------------------------------------------------===//
-
-#include "Annotations.h"
-#include "Config.h"
-#include "SourceCode.h"
-#include "TestFS.h"
-#include "TestTU.h"
-#include "TweakTesting.h"
-#include "refactor/Tweak.h"
-#include "clang/AST/Expr.h"
-#include "clang/Basic/Diagnostic.h"
-#include "clang/Basic/DiagnosticIDs.h"
-#include "clang/Basic/DiagnosticOptions.h"
-#include "clang/Basic/FileManager.h"
-#include "clang/Basic/FileSystemOptions.h"
-#include "clang/Basic/LLVM.h"
-#include "clang/Basic/SourceLocation.h"
-#include "clang/Basic/SourceManager.h"
-#include "clang/Rewrite/Core/Rewriter.h"
-#include "clang/Tooling/Core/Replacement.h"
-#include "llvm/ADT/IntrusiveRefCntPtr.h"
-#include "llvm/ADT/StringExtras.h"
-#include "llvm/ADT/StringMap.h"
-#include "llvm/ADT/StringRef.h"
-#include "llvm/Support/Error.h"
-#include "llvm/Support/MemoryBuffer.h"
-#include "llvm/Support/VirtualFileSystem.h"
-#include "llvm/Testing/Support/Error.h"
-#include "gmock/gmock-matchers.h"
-#include "gmock/gmock.h"
-#include "gtest/gtest.h"
-#include <cassert>
-#include <string>
-#include <utility>
-#include <vector>
-
-using ::testing::AllOf;
-using ::testing::ElementsAre;
-using ::testing::HasSubstr;
-using ::testing::StartsWith;
-
-namespace clang {
-namespace clangd {
-namespace {
-
-MATCHER_P2(FileWithContents, FileName, Contents, "") {
-  return arg.first() == FileName && arg.second == Contents;
-}
-
-TEST(FileEdits, AbsolutePath) {
-  auto RelPaths = {"a.h", "foo.cpp", "test/test.cpp"};
-
-  llvm::IntrusiveRefCntPtr<llvm::vfs::InMemoryFileSystem> MemFS(
-      new llvm::vfs::InMemoryFileSystem);
-  MemFS->setCurrentWorkingDirectory(testRoot());
-  for (auto Path : RelPaths)
-    MemFS->addFile(Path, 0, llvm::MemoryBuffer::getMemBuffer("", Path));
-  FileManager FM(FileSystemOptions(), MemFS);
-  DiagnosticsEngine DE(new DiagnosticIDs, new DiagnosticOptions);
-  SourceManager SM(DE, FM);
-
-  for (auto Path : RelPaths) {
-    auto FID = SM.createFileID(*FM.getFile(Path), SourceLocation(),
-                               clang::SrcMgr::C_User);
-    auto Res = Tweak::Effect::fileEdit(SM, FID, tooling::Replacements());
-    ASSERT_THAT_EXPECTED(Res, llvm::Succeeded());
-    EXPECT_EQ(Res->first, testPath(Path));
-  }
-}
-
-TWEAK_TEST(SwapIfBranches);
-TEST_F(SwapIfBranchesTest, Test) {
-  Context = Function;
-  EXPECT_EQ(apply("^if (true) {return;} else {(void)0;}"),
-            "if (true) {(void)0;} else {return;}");
-  EXPECT_EQ(apply("^if (/*error-ok*/) {return;} else {(void)0;}"),
-            "if (/*error-ok*/) {(void)0;} else {return;}")
-      << "broken condition";
-  EXPECT_AVAILABLE("^i^f^^(^t^r^u^e^) { return; } ^e^l^s^e^ { return; }");
-  EXPECT_UNAVAILABLE("if (true) {^return ^;^ } else { ^return^;^ }");
-  // Available in subexpressions of the condition;
-  EXPECT_THAT("if(2 + [[2]] + 2) { return; } else {return;}", isAvailable());
-  // But not as part of the branches.
-  EXPECT_THAT("if(2 + 2 + 2) { [[return]]; } else { return; }",
-              Not(isAvailable()));
-  // Range covers the "else" token, so available.
-  EXPECT_THAT("if(2 + 2 + 2) { return[[; } else {return;]]}", isAvailable());
-  // Not available in compound statements in condition.
-  EXPECT_THAT("if([]{return [[true]];}()) { return; } else { return; }",
-              Not(isAvailable()));
-  // Not available if both sides aren't braced.
-  EXPECT_THAT("^if (1) return; else { return; }", Not(isAvailable()));
-  // Only one if statement is supported!
-  EXPECT_THAT("[[if(1){}else{}if(2){}else{}]]", Not(isAvailable()));
-}
-
-TWEAK_TEST(RawStringLiteral);
-TEST_F(RawStringLiteralTest, Test) {
-  Context = Expression;
-  EXPECT_AVAILABLE(R"cpp(^"^f^o^o^\^n^")cpp");
-  EXPECT_AVAILABLE(R"cpp(R"(multi )" ^"token " "str\ning")cpp");
-  EXPECT_UNAVAILABLE(R"cpp(^"f^o^o^o")cpp"); // no chars need escaping
-  EXPECT_UNAVAILABLE(R"cpp(R"(multi )" ^"token " u8"str\ning")cpp"); // nonascii
-  EXPECT_UNAVAILABLE(R"cpp(^R^"^(^multi )" "token " "str\ning")cpp"); // raw
-  EXPECT_UNAVAILABLE(R"cpp(^"token\n" __FILE__)cpp"); // chunk is macro
-  EXPECT_UNAVAILABLE(R"cpp(^"a\r\n";)cpp");           // forbidden escape char
-
-  const char *Input = R"cpp(R"(multi
-token)" "\nst^ring\n" "literal")cpp";
-  const char *Output = R"cpp(R"(multi
-token
-string
-literal)")cpp";
-  EXPECT_EQ(apply(Input), Output);
-}
-
-TWEAK_TEST(ObjCLocalizeStringLiteral);
-TEST_F(ObjCLocalizeStringLiteralTest, Test) {
-  ExtraArgs.push_back("-x");
-  ExtraArgs.push_back("objective-c");
-
-  // Ensure the action can be initiated in the string literal.
-  EXPECT_AVAILABLE(R"(id x = ^[[@[[^"^t^est^"]]]];)");
-
-  // Ensure that the action can't be initiated in other places.
-  EXPECT_UNAVAILABLE(R"([[i^d ^[[x]] ^= @"test";^]])");
-
-  // Ensure that the action is not available for regular C strings.
-  EXPECT_UNAVAILABLE(R"(const char * x= "^test";)");
-
-  const char *Input = R"(id x = [[@"test"]];)";
-  const char *Output = R"(id x = NSLocalizedString(@"test", @"");)";
-  EXPECT_EQ(apply(Input), Output);
-}
-
-TWEAK_TEST(DumpAST);
-TEST_F(DumpASTTest, Test) {
-  EXPECT_AVAILABLE("^int f^oo() { re^turn 2 ^+ 2; }");
-  EXPECT_UNAVAILABLE("/*c^omment*/ int foo() { return 2 ^ + 2; }");
-  EXPECT_THAT(apply("int x = 2 ^+ 2;"),
-              AllOf(StartsWith("message:"), HasSubstr("BinaryOperator"),
-                    HasSubstr("'+'"), HasSubstr("|-IntegerLiteral"),
-                    HasSubstr("<col:9> 'int' 2\n`-IntegerLiteral"),
-                    HasSubstr("<col:13> 'int' 2")));
-}
-
-TWEAK_TEST(DumpSymbol);
-TEST_F(DumpSymbolTest, Test) {
-  std::string ID = R"("id":"CA2EBE44A1D76D2A")";
-  std::string USR = R"("usr":"c:@F@foo#")";
-  EXPECT_THAT(apply("void f^oo();"),
-              AllOf(StartsWith("message:"), testing::HasSubstr(ID),
-                    testing::HasSubstr(USR)));
-}
-
-TWEAK_TEST(ShowSelectionTree);
-TEST_F(ShowSelectionTreeTest, Test) {
-  EXPECT_AVAILABLE("^int f^oo() { re^turn 2 ^+ 2; }");
-  EXPECT_AVAILABLE("/*c^omment*/ int foo() { return 2 ^ + 2; }");
-
-  const char *Output = R"(message:
- TranslationUnitDecl 
-   VarDecl int x = fcall(2 + 2)
-    .CallExpr fcall(2 + 2)
-       ImplicitCastExpr fcall
-        .DeclRefExpr fcall
-      .BinaryOperator 2 + 2
-        *IntegerLiteral 2
-)";
-  EXPECT_EQ(apply("int fcall(int); int x = fca[[ll(2 +]]2);"), Output);
-
-  Output = R"(message:
- TranslationUnitDecl 
-   FunctionDecl void x()
-     CompoundStmt { …
-       ForStmt for (;;) …
-        *BreakStmt break;
-)";
-  EXPECT_EQ(apply("void x() { for (;;) br^eak; }"), Output);
-}
-
-TWEAK_TEST(DumpRecordLayout);
-TEST_F(DumpRecordLayoutTest, Test) {
-  EXPECT_AVAILABLE("^s^truct ^X ^{ int x; ^};");
-  EXPECT_THAT("struct X { int ^a; };", Not(isAvailable()));
-  EXPECT_THAT("struct ^X;", Not(isAvailable()));
-  EXPECT_THAT("template <typename T> struct ^X { T t; };", Not(isAvailable()));
-  EXPECT_THAT("enum ^X {};", Not(isAvailable()));
-
-  EXPECT_THAT(apply("struct ^X { int x; int y; };"),
-              AllOf(StartsWith("message:"), HasSubstr("0 |   int x")));
-}
-
-TWEAK_TEST(ExtractVariable);
-TEST_F(ExtractVariableTest, Test) {
-  const char *AvailableCases = R"cpp(
-    int xyz(int a = 1) {
-      struct T {
-        int bar(int a = 1);
-        int z;
-      } t;
-      // return statement
-      return [[[[t.b[[a]]r]](t.z)]];
-    }
-    void f() {
-      int a = [[5 +]] [[4 * [[[[xyz]]()]]]];
-      // multivariable initialization
-      if(1)
-        int x = [[1]], y = [[a + 1]], a = [[1]], z = a + 1;
-      // if without else
-      if([[1]])
-        a = [[1]] + 1;
-      // if with else
-      if(a < [[3]])
-        if(a == [[4]])
-          a = [[5]] + 1;
-        else
-          a = [[5]] + 1;
-      else if (a < [[4]])
-        a = [[4]] + 1;
-      else
-        a = [[5]] + 1;
-      // for loop
-      for(a = [[1]] + 1; a > [[[[3]] + [[4]]]]; a++)
-        a = [[2]] + 1;
-      // while
-      while(a < [[1]])
-        a = [[1]] + 1;
-      // do while
-      do
-        a = [[1]] + 1;
-      while(a < [[3]]);
-    }
-  )cpp";
-  EXPECT_AVAILABLE(AvailableCases);
-
-  ExtraArgs = {"-xc"};
-  const char *AvailableButC = R"cpp(
-    void foo() {
-      int x = [[1]];
-    })cpp";
-  EXPECT_UNAVAILABLE(AvailableButC);
-  ExtraArgs = {};
-
-  const char *NoCrashCases = R"cpp(
-    // error-ok: broken code, but shouldn't crash
-    template<typename T, typename ...Args>
-    struct Test<T, Args...> {
-    Test(const T &v) :val[[(^]]) {}
-      T val;
-    };
-  )cpp";
-  EXPECT_UNAVAILABLE(NoCrashCases);
-
-  const char *UnavailableCases = R"cpp(
-    int xyz(int a = [[1]]) {
-      struct T {
-        int bar(int a = [[1]]);
-        int z = [[1]];
-      } t;
-      return [[t]].bar([[[[t]].z]]);
-    }
-    void v() { return; }
-    // function default argument
-    void f(int b = [[1]]) {
-      // empty selection
-      int a = ^1 ^+ ^2;
-      // void expressions
-      auto i = new int, j = new int;
-      [[[[delete i]], delete j]];
-      [[v]]();
-      // if
-      if(1)
-        int x = 1, y = a + 1, a = 1, z = [[a + 1]];
-      if(int a = 1)
-        if([[a + 1]] == 4)
-          a = [[[[a]] +]] 1;
-      // for loop
-      for(int a = 1, b = 2, c = 3; a > [[b + c]]; [[a++]])
-        a = [[a + 1]];
-      // lambda
-      auto lamb = [&[[a]], &[[b]]](int r = [[1]]) {return 1;};
-      // assignment
-      xyz([[a = 5]]);
-      xyz([[a *= 5]]);
-      // Variable DeclRefExpr
-      a = [[b]];
-      a = [[xyz()]];
-      // statement expression
-      [[xyz()]];
-      while (a)
-        [[++a]];
-      // label statement
-      goto label;
-      label:
-        a = [[1]];
-    }
-  )cpp";
-  EXPECT_UNAVAILABLE(UnavailableCases);
-
-  // vector of pairs of input and output strings
-  const std::vector<std::pair<std::string, std::string>> InputOutputs = {
-      // extraction from variable declaration/assignment
-      {R"cpp(void varDecl() {
-                   int a = 5 * (4 + (3 [[- 1)]]);
-                 })cpp",
-       R"cpp(void varDecl() {
-                   auto dummy = (3 - 1); int a = 5 * (4 + dummy);
-                 })cpp"},
-      // FIXME: extraction from switch case
-      /*{R"cpp(void f(int a) {
-               if(1)
-                 while(a < 1)
-                   switch (1) {
-                       case 1:
-                         a = [[1 + 2]];
-                         break;
-                       default:
-                         break;
-                   }
-             })cpp",
-       R"cpp(void f(int a) {
-               auto dummy = 1 + 2; if(1)
-                 while(a < 1)
-                   switch (1) {
-                       case 1:
-                         a = dummy;
-                         break;
-                       default:
-                         break;
-                   }
-             })cpp"},*/
-      // Macros
-      {R"cpp(#define PLUS(x) x++
-                 void f(int a) {
-                   int y = PLUS([[1+a]]);
-                 })cpp",
-       /*FIXME: It should be extracted like this.
-        R"cpp(#define PLUS(x) x++
-              void f(int a) {
-                auto dummy = 1+a; int y = PLUS(dummy);
-              })cpp"},*/
-       R"cpp(#define PLUS(x) x++
-                 void f(int a) {
-                   auto dummy = PLUS(1+a); int y = dummy;
-                 })cpp"},
-      // ensure InsertionPoint isn't inside a macro
-      {R"cpp(#define LOOP(x) while (1) {a = x;}
-                 void f(int a) {
-                   if(1)
-                    LOOP(5 + [[3]])
-                 })cpp",
-       R"cpp(#define LOOP(x) while (1) {a = x;}
-                 void f(int a) {
-                   auto dummy = 3; if(1)
-                    LOOP(5 + dummy)
-                 })cpp"},
-      {R"cpp(#define LOOP(x) do {x;} while(1);
-                 void f(int a) {
-                   if(1)
-                    LOOP(5 + [[3]])
-                 })cpp",
-       R"cpp(#define LOOP(x) do {x;} while(1);
-                 void f(int a) {
-                   auto dummy = 3; if(1)
-                    LOOP(5 + dummy)
-                 })cpp"},
-      // attribute testing
-      {R"cpp(void f(int a) {
-                    [ [gsl::suppress("type")] ] for (;;) a = [[1]] + 1;
-                 })cpp",
-       R"cpp(void f(int a) {
-                    auto dummy = 1; [ [gsl::suppress("type")] ] for (;;) a = dummy + 1;
-                 })cpp"},
-      // MemberExpr
-      {R"cpp(class T {
-                   T f() {
-                     return [[T().f()]].f();
-                   }
-                 };)cpp",
-       R"cpp(class T {
-                   T f() {
-                     auto dummy = T().f(); return dummy.f();
-                   }
-                 };)cpp"},
-      // Function DeclRefExpr
-      {R"cpp(int f() {
-                   return [[f]]();
-                 })cpp",
-       R"cpp(int f() {
-                   auto dummy = f(); return dummy;
-                 })cpp"},
-      // FIXME: Wrong result for \[\[clang::uninitialized\]\] int b = [[1]];
-      // since the attr is inside the DeclStmt and the bounds of
-      // DeclStmt don't cover the attribute.
-
-      // Binary subexpressions
-      {R"cpp(void f() {
-                   int x = 1 + [[2 + 3 + 4]] + 5;
-                 })cpp",
-       R"cpp(void f() {
-                   auto dummy = 2 + 3 + 4; int x = 1 + dummy + 5;
-                 })cpp"},
-      {R"cpp(void f() {
-                   int x = [[1 + 2 + 3]] + 4 + 5;
-                 })cpp",
-       R"cpp(void f() {
-                   auto dummy = 1 + 2 + 3; int x = dummy + 4 + 5;
-                 })cpp"},
-      {R"cpp(void f() {
-                   int x = 1 + 2 + [[3 + 4 + 5]];
-                 })cpp",
-       R"cpp(void f() {
-                   auto dummy = 3 + 4 + 5; int x = 1 + 2 + dummy;
-                 })cpp"},
-      // Non-associative operations have no special support
-      {R"cpp(void f() {
-                   int x = 1 - [[2 - 3 - 4]] - 5;
-                 })cpp",
-       R"cpp(void f() {
-                   auto dummy = 1 - 2 - 3 - 4; int x = dummy - 5;
-                 })cpp"},
-      // A mix of associative operators isn't associative.
-      {R"cpp(void f() {
-                   int x = 0 + 1 * [[2 + 3]] * 4 + 5;
-                 })cpp",
-       R"cpp(void f() {
-                   auto dummy = 1 * 2 + 3 * 4; int x = 0 + dummy + 5;
-                 })cpp"},
-      // Overloaded operators are supported, we assume associativity
-      // as if they were built-in.
-      {R"cpp(struct S {
-                   S(int);
-                 };
-                 S operator+(S, S);
-
-                 void f() {
-                   S x = S(1) + [[S(2) + S(3) + S(4)]] + S(5);
-                 })cpp",
-       R"cpp(struct S {
-                   S(int);
-                 };
-                 S operator+(S, S);
-
-                 void f() {
-                   auto dummy = S(2) + S(3) + S(4); S x = S(1) + dummy + S(5);
-                 })cpp"},
-      // Don't try to analyze across macro boundaries
-      // FIXME: it'd be nice to do this someday (in a safe way)
-      {R"cpp(#define ECHO(X) X
-                 void f() {
-                   int x = 1 + [[ECHO(2 + 3) + 4]] + 5;
-                 })cpp",
-       R"cpp(#define ECHO(X) X
-                 void f() {
-                   auto dummy = 1 + ECHO(2 + 3) + 4; int x = dummy + 5;
-                 })cpp"},
-      {R"cpp(#define ECHO(X) X
-                 void f() {
-                   int x = 1 + [[ECHO(2) + ECHO(3) + 4]] + 5;
-                 })cpp",
-       R"cpp(#define ECHO(X) X
-                 void f() {
-                   auto dummy = 1 + ECHO(2) + ECHO(3) + 4; int x = dummy + 5;
-                 })cpp"},
-  };
-  for (const auto &IO : InputOutputs) {
-    EXPECT_EQ(IO.second, apply(IO.first)) << IO.first;
-  }
-}
-
-TWEAK_TEST(AnnotateHighlightings);
-TEST_F(AnnotateHighlightingsTest, Test) {
-  EXPECT_AVAILABLE("^vo^id^ ^f(^) {^}^"); // available everywhere.
-  EXPECT_AVAILABLE("[[int a; int b;]]");
-  EXPECT_EQ("void /* entity.name.function.cpp */f() {}", apply("void ^f() {}"));
-
-  EXPECT_EQ(apply("[[void f1(); void f2();]]"),
-            "void /* entity.name.function.cpp */f1(); "
-            "void /* entity.name.function.cpp */f2();");
-
-  EXPECT_EQ(apply("void f1(); void f2() {^}"),
-            "void f1(); "
-            "void /* entity.name.function.cpp */f2() {}");
-}
-
-TWEAK_TEST(ExpandMacro);
-TEST_F(ExpandMacroTest, Test) {
-  Header = R"cpp(
-    // error-ok: not real c++, just token manipulation
-    #define FOO 1 2 3
-    #define FUNC(X) X+X+X
-    #define EMPTY
-    #define EMPTY_FN(X)
-  )cpp";
-
-  // Available on macro names, not available anywhere else.
-  EXPECT_AVAILABLE("^F^O^O^ BAR ^F^O^O^");
-  EXPECT_AVAILABLE("^F^U^N^C^(1)");
-  EXPECT_UNAVAILABLE("^#^d^efine^ ^XY^Z 1 ^2 ^3^");
-  EXPECT_UNAVAILABLE("FOO ^B^A^R^ FOO ^");
-  EXPECT_UNAVAILABLE("FUNC(^1^)^");
-
-  // Works as expected on object-like macros.
-  EXPECT_EQ(apply("^FOO BAR FOO"), "1 2 3 BAR FOO");
-  EXPECT_EQ(apply("FOO BAR ^FOO"), "FOO BAR 1 2 3");
-  // And function-like macros.
-  EXPECT_EQ(apply("F^UNC(2)"), "2 + 2 + 2");
-
-  // Works on empty macros.
-  EXPECT_EQ(apply("int a ^EMPTY;"), "int a ;");
-  EXPECT_EQ(apply("int a ^EMPTY_FN(1 2 3);"), "int a ;");
-  EXPECT_EQ(apply("int a = 123 ^EMPTY EMPTY_FN(1);"),
-            "int a = 123  EMPTY_FN(1);");
-  EXPECT_EQ(apply("int a = 123 ^EMPTY_FN(1) EMPTY;"), "int a = 123  EMPTY;");
-  EXPECT_EQ(apply("int a = 123 EMPTY_FN(1) ^EMPTY;"),
-            "int a = 123 EMPTY_FN(1) ;");
-}
-
-TWEAK_TEST(ExpandAutoType);
-TEST_F(ExpandAutoTypeTest, Test) {
-
-  Header = R"cpp(
-    namespace ns {
-      struct Class {
-        struct Nested {};
-      };
-      void Func();
-    }
-    inline namespace inl_ns {
-      namespace {
-        struct Visible {};
-      }
-    }
-  )cpp";
-
-  EXPECT_AVAILABLE("^a^u^t^o^ i = 0;");
-  EXPECT_UNAVAILABLE("auto ^i^ ^=^ ^0^;^");
-
-  // check primitive type
-  EXPECT_EQ(apply("[[auto]] i = 0;"), "int i = 0;");
-  EXPECT_EQ(apply("au^to i = 0;"), "int i = 0;");
-  // check classes and namespaces
-  EXPECT_EQ(apply("^auto C = ns::Class::Nested();"),
-            "ns::Class::Nested C = ns::Class::Nested();");
-  // check that namespaces are shortened
-  EXPECT_EQ(apply("namespace ns { void f() { ^auto C = Class(); } }"),
-            "namespace ns { void f() { Class C = Class(); } }");
-  // undefined functions should not be replaced
-  EXPECT_THAT(apply("au^to x = doesnt_exist(); // error-ok"),
-              StartsWith("fail: Could not deduce type for 'auto' type"));
-  // function pointers should not be replaced
-  EXPECT_THAT(apply("au^to x = &ns::Func;"),
-              StartsWith("fail: Could not expand type of function pointer"));
-  // lambda types are not replaced
-  EXPECT_UNAVAILABLE("au^to x = []{};");
-  // inline namespaces
-  EXPECT_EQ(apply("au^to x = inl_ns::Visible();"),
-            "Visible x = inl_ns::Visible();");
-  // local class
-  EXPECT_EQ(apply("namespace x { void y() { struct S{}; ^auto z = S(); } }"),
-            "namespace x { void y() { struct S{}; S z = S(); } }");
-  // replace array types
-  EXPECT_EQ(apply(R"cpp(au^to x = "test";)cpp"),
-            R"cpp(const char * x = "test";)cpp");
-
-  EXPECT_UNAVAILABLE("dec^ltype(au^to) x = 10;");
-  // expanding types in structured bindings is syntactically invalid.
-  EXPECT_UNAVAILABLE("const ^auto &[x,y] = (int[]){1,2};");
-
-  // FIXME: Auto-completion in a template requires disabling delayed template
-  // parsing.
-  ExtraArgs.push_back("-fno-delayed-template-parsing");
-  // unknown types in a template should not be replaced
-  EXPECT_THAT(apply("template <typename T> void x() { ^auto y = T::z(); }"),
-              StartsWith("fail: Could not deduce type for 'auto' type"));
-}
-
-TWEAK_TEST(ExtractFunction);
-TEST_F(ExtractFunctionTest, FunctionTest) {
-  Context = Function;
-
-  // Root statements should have common parent.
-  EXPECT_EQ(apply("for(;;) [[1+2; 1+2;]]"), "unavailable");
-  // Expressions aren't extracted.
-  EXPECT_EQ(apply("int x = 0; [[x++;]]"), "unavailable");
-  // We don't support extraction from lambdas.
-  EXPECT_EQ(apply("auto lam = [](){ [[int x;]] }; "), "unavailable");
-  // Partial statements aren't extracted.
-  EXPECT_THAT(apply("int [[x = 0]];"), "unavailable");
-  // FIXME: Support hoisting.
-  EXPECT_THAT(apply(" [[int a = 5;]] a++; "), "unavailable");
-
-  // Ensure that end of Zone and Beginning of PostZone being adjacent doesn't
-  // lead to break being included in the extraction zone.
-  EXPECT_THAT(apply("for(;;) { [[int x;]]break; }"), HasSubstr("extracted"));
-  // FIXME: ExtractFunction should be unavailable inside loop construct
-  // initializer/condition.
-  EXPECT_THAT(apply(" for([[int i = 0;]];);"), HasSubstr("extracted"));
-  // Extract certain return
-  EXPECT_THAT(apply(" if(true) [[{ return; }]] "), HasSubstr("extracted"));
-  // Don't extract uncertain return
-  EXPECT_THAT(apply(" if(true) [[if (false) return;]] "),
-              StartsWith("unavailable"));
-  EXPECT_THAT(
-      apply("#define RETURN_IF_ERROR(x) if (x) return\nRETU^RN_IF_ERROR(4);"),
-      StartsWith("unavailable"));
-
-  FileName = "a.c";
-  EXPECT_THAT(apply(" for([[int i = 0;]];);"), HasSubstr("unavailable"));
-}
-
-TEST_F(ExtractFunctionTest, FileTest) {
-  // Check all parameters are in order
-  std::string ParameterCheckInput = R"cpp(
-struct Foo {
-  int x;
-};
-void f(int a) {
-  int b;
-  int *ptr = &a;
-  Foo foo;
-  [[a += foo.x + b;
-  *ptr++;]]
-})cpp";
-  std::string ParameterCheckOutput = R"cpp(
-struct Foo {
-  int x;
-};
-void extracted(int &a, int &b, int * &ptr, Foo &foo) {
-a += foo.x + b;
-  *ptr++;
-}
-void f(int a) {
-  int b;
-  int *ptr = &a;
-  Foo foo;
-  extracted(a, b, ptr, foo);
-})cpp";
-  EXPECT_EQ(apply(ParameterCheckInput), ParameterCheckOutput);
-
-  // Check const qualifier
-  std::string ConstCheckInput = R"cpp(
-void f(const int c) {
-  [[while(c) {}]]
-})cpp";
-  std::string ConstCheckOutput = R"cpp(
-void extracted(const int &c) {
-while(c) {}
-}
-void f(const int c) {
-  extracted(c);
-})cpp";
-  EXPECT_EQ(apply(ConstCheckInput), ConstCheckOutput);
-
-  // Don't extract when we need to make a function as a parameter.
-  EXPECT_THAT(apply("void f() { [[int a; f();]] }"), StartsWith("fail"));
-
-  // We don't extract from methods for now since they may involve multi-file
-  // edits
-  std::string MethodFailInput = R"cpp(
-    class T {
-      void f() {
-        [[int x;]]
-      }
-    };
-  )cpp";
-  EXPECT_EQ(apply(MethodFailInput), "unavailable");
-
-  // We don't extract from templated functions for now as templates are hard
-  // to deal with.
-  std::string TemplateFailInput = R"cpp(
-    template<typename T>
-    void f() {
-      [[int x;]]
-    }
-  )cpp";
-  EXPECT_EQ(apply(TemplateFailInput), "unavailable");
-
-  std::string MacroInput = R"cpp(
-    #define F(BODY) void f() { BODY }
-    F ([[int x = 0;]])
-  )cpp";
-  std::string MacroOutput = R"cpp(
-    #define F(BODY) void f() { BODY }
-    void extracted() {
-int x = 0;
-}
-F (extracted();)
-  )cpp";
-  EXPECT_EQ(apply(MacroInput), MacroOutput);
-
-  // Shouldn't crash.
-  EXPECT_EQ(apply("void f([[int a]]);"), "unavailable");
-  // Don't extract if we select the entire function body (CompoundStmt).
-  std::string CompoundFailInput = R"cpp(
-    void f() [[{
-      int a;
-    }]]
-  )cpp";
-  EXPECT_EQ(apply(CompoundFailInput), "unavailable");
-}
-
-TEST_F(ExtractFunctionTest, ControlFlow) {
-  Context = Function;
-  // We should be able to extract break/continue with a parent loop/switch.
-  EXPECT_THAT(apply(" [[for(;;) if(1) break;]] "), HasSubstr("extracted"));
-  EXPECT_THAT(apply(" for(;;) [[while(1) break;]] "), HasSubstr("extracted"));
-  EXPECT_THAT(apply(" [[switch(1) { break; }]]"), HasSubstr("extracted"));
-  EXPECT_THAT(apply(" [[while(1) switch(1) { continue; }]]"),
-              HasSubstr("extracted"));
-  // Don't extract break and continue without a loop/switch parent.
-  EXPECT_THAT(apply(" for(;;) [[if(1) continue;]] "), StartsWith("fail"));
-  EXPECT_THAT(apply(" while(1) [[if(1) break;]] "), StartsWith("fail"));
-  EXPECT_THAT(apply(" switch(1) { [[break;]] }"), StartsWith("fail"));
-  EXPECT_THAT(apply(" for(;;) { [[while(1) break; break;]] }"),
-              StartsWith("fail"));
-}
-
-TEST_F(ExtractFunctionTest, ExistingReturnStatement) {
-  Context = File;
-  const char *Before = R"cpp(
-    bool lucky(int N);
-    int getNum(bool Superstitious, int Min, int Max) {
-      if (Superstitious) [[{
-        for (int I = Min; I <= Max; ++I)
-          if (lucky(I))
-            return I;
-        return -1;
-      }]] else {
-        return (Min + Max) / 2;
-      }
-    }
-  )cpp";
-  // FIXME: min/max should be by value.
-  // FIXME: avoid emitting redundant braces
-  const char *After = R"cpp(
-    bool lucky(int N);
-    int extracted(int &Min, int &Max) {
-{
-        for (int I = Min; I <= Max; ++I)
-          if (lucky(I))
-            return I;
-        return -1;
-      }
-}
-int getNum(bool Superstitious, int Min, int Max) {
-      if (Superstitious) return extracted(Min, Max); else {
-        return (Min + Max) / 2;
-      }
-    }
-  )cpp";
-  EXPECT_EQ(apply(Before), After);
-}
-
-TWEAK_TEST(RemoveUsingNamespace);
-TEST_F(RemoveUsingNamespaceTest, All) {
-  std::pair<llvm::StringRef /*Input*/, llvm::StringRef /*Expected*/> Cases[] = {
-      {// Remove all occurrences of ns. Qualify only unqualified.
-       R"cpp(
-      namespace ns1 { struct vector {}; }
-      namespace ns2 { struct map {}; }
-      using namespace n^s1;
-      using namespace ns2;
-      using namespace ns1;
-      int main() {
-        ns1::vector v1;
-        vector v2;
-        map m1;
-      }
-    )cpp",
-       R"cpp(
-      namespace ns1 { struct vector {}; }
-      namespace ns2 { struct map {}; }
-      
-      using namespace ns2;
-      
-      int main() {
-        ns1::vector v1;
-        ns1::vector v2;
-        map m1;
-      }
-    )cpp"},
-      {// Ident to be qualified is a macro arg.
-       R"cpp(
-      #define DECLARE(x, y) x y
-      namespace ns { struct vector {}; }
-      using namespace n^s;
-      int main() {
-        DECLARE(ns::vector, v1);
-        DECLARE(vector, v2);
-      }
-    )cpp",
-       R"cpp(
-      #define DECLARE(x, y) x y
-      namespace ns { struct vector {}; }
-      
-      int main() {
-        DECLARE(ns::vector, v1);
-        DECLARE(ns::vector, v2);
-      }
-    )cpp"},
-      {// Nested namespace: Fully qualify ident from inner ns.
-       R"cpp(
-      namespace aa { namespace bb { struct map {}; }}
-      using namespace aa::b^b;
-      int main() {
-        map m;
-      }
-    )cpp",
-       R"cpp(
-      namespace aa { namespace bb { struct map {}; }}
-      
-      int main() {
-        aa::bb::map m;
-      }
-    )cpp"},
-      {// Nested namespace: Fully qualify ident from inner ns.
-       R"cpp(
-      namespace aa { namespace bb { struct map {}; }}
-      using namespace a^a;
-      int main() {
-        bb::map m;
-      }
-    )cpp",
-       R"cpp(
-      namespace aa { namespace bb { struct map {}; }}
-      
-      int main() {
-        aa::bb::map m;
-      }
-    )cpp"},
-      {// Typedef.
-       R"cpp(
-      namespace aa { namespace bb { struct map {}; }}
-      using namespace a^a;
-      typedef bb::map map;
-      int main() { map M; }
-    )cpp",
-       R"cpp(
-      namespace aa { namespace bb { struct map {}; }}
-      
-      typedef aa::bb::map map;
-      int main() { map M; }
-    )cpp"},
-      {// FIXME: Nested namespaces: Not aware of using ns decl of outer ns.
-       R"cpp(
-      namespace aa { namespace bb { struct map {}; }}
-      using name[[space aa::b]]b;
-      using namespace aa;
-      int main() {
-        map m;
-      }
-    )cpp",
-       R"cpp(
-      namespace aa { namespace bb { struct map {}; }}
-      
-      using namespace aa;
-      int main() {
-        aa::bb::map m;
-      }
-    )cpp"},
-      {// Does not qualify ident from inner namespace.
-       R"cpp(
-      namespace aa { namespace bb { struct map {}; }}
-      using namespace aa::bb;
-      using namespace a^a;
-      int main() {
-        map m;
-      }
-    )cpp",
-       R"cpp(
-      namespace aa { namespace bb { struct map {}; }}
-      using namespace aa::bb;
-      
-      int main() {
-        map m;
-      }
-    )cpp"},
-      {// Available only for top level namespace decl.
-       R"cpp(
-        namespace aa {
-          namespace bb { struct map {}; }
-          using namespace b^b;
-        }
-        int main() { aa::map m; }
-    )cpp",
-       "unavailable"},
-      {// FIXME: Unavailable for namespaces containing using-namespace decl.
-       R"cpp(
-      namespace aa {
-        namespace bb { struct map {}; }
-        using namespace bb;
-      }
-      using namespace a^a;
-      int main() {
-        map m;
-      }
-    )cpp",
-       "unavailable"},
-      {R"cpp(
-      namespace a::b { struct Foo {}; }
-      using namespace a;
-      using namespace a::[[b]];
-      using namespace b;
-      int main() { Foo F;}
-    )cpp",
-       R"cpp(
-      namespace a::b { struct Foo {}; }
-      using namespace a;
-      
-      
-      int main() { a::b::Foo F;}
-    )cpp"},
-      {R"cpp(
-      namespace a::b { struct Foo {}; }
-      using namespace a;
-      using namespace a::b;
-      using namespace [[b]];
-      int main() { Foo F;}
-    )cpp",
-       R"cpp(
-      namespace a::b { struct Foo {}; }
-      using namespace a;
-      
-      
-      int main() { b::Foo F;}
-    )cpp"},
-      {// Enumerators.
-       R"cpp(
-      namespace tokens {
-      enum Token {
-        comma, identifier, numeric
-      };
-      }
-      using namespace tok^ens;
-      int main() {
-        auto x = comma;
-      }
-    )cpp",
-       R"cpp(
-      namespace tokens {
-      enum Token {
-        comma, identifier, numeric
-      };
-      }
-      
-      int main() {
-        auto x = tokens::comma;
-      }
-    )cpp"},
-      {// inline namespaces.
-       R"cpp(
-      namespace std { inline namespace ns1 { inline namespace ns2 { struct vector {}; }}}
-      using namespace st^d;
-      int main() {
-        vector V;
-      }
-    )cpp",
-       R"cpp(
-      namespace std { inline namespace ns1 { inline namespace ns2 { struct vector {}; }}}
-      
-      int main() {
-        std::vector V;
-      }
-    )cpp"}};
-  for (auto C : Cases)
-    EXPECT_EQ(C.second, apply(C.first)) << C.first;
-}
-
-TWEAK_TEST(DefineInline);
-TEST_F(DefineInlineTest, TriggersOnFunctionDecl) {
-  // Basic check for function body and signature.
-  EXPECT_AVAILABLE(R"cpp(
-  class Bar {
-    void baz();
-  };
-
-  [[void [[Bar::[[b^a^z]]]]() [[{
-    return;
-  }]]]]
-
-  void foo();
-  [[void [[f^o^o]]() [[{
-    return;
-  }]]]]
-  )cpp");
-
-  EXPECT_UNAVAILABLE(R"cpp(
-  // Not a definition
-  vo^i[[d^ ^f]]^oo();
-
-  [[vo^id ]]foo[[()]] {[[
-    [[(void)(5+3);
-    return;]]
-  }]]
-
-  // Definition with no body.
-  class Bar { Bar() = def^ault; };
-  )cpp");
-}
-
-TEST_F(DefineInlineTest, NoForwardDecl) {
-  Header = "void bar();";
-  EXPECT_UNAVAILABLE(R"cpp(
-  void bar() {
-    return;
-  }
-  // FIXME: Generate a decl in the header.
-  void fo^o() {
-    return;
-  })cpp");
-}
-
-TEST_F(DefineInlineTest, ReferencedDecls) {
-  EXPECT_AVAILABLE(R"cpp(
-    void bar();
-    void foo(int test);
-
-    void fo^o(int baz) {
-      int x = 10;
-      bar();
-    })cpp");
-
-  // Internal symbol usage.
-  Header = "void foo(int test);";
-  EXPECT_UNAVAILABLE(R"cpp(
-    void bar();
-    void fo^o(int baz) {
-      int x = 10;
-      bar();
-    })cpp");
-
-  // Becomes available after making symbol visible.
-  Header = "void bar();" + Header;
-  EXPECT_AVAILABLE(R"cpp(
-    void fo^o(int baz) {
-      int x = 10;
-      bar();
-    })cpp");
-
-  // FIXME: Move declaration below bar to make it visible.
-  Header.clear();
-  EXPECT_UNAVAILABLE(R"cpp(
-    void foo();
-    void bar();
-
-    void fo^o() {
-      bar();
-    })cpp");
-
-  // Order doesn't matter within a class.
-  EXPECT_AVAILABLE(R"cpp(
-    class Bar {
-      void foo();
-      void bar();
-    };
-
-    void Bar::fo^o() {
-      bar();
-    })cpp");
-
-  // FIXME: Perform include insertion to make symbol visible.
-  ExtraFiles["a.h"] = "void bar();";
-  Header = "void foo(int test);";
-  EXPECT_UNAVAILABLE(R"cpp(
-    #include "a.h"
-    void fo^o(int baz) {
-      int x = 10;
-      bar();
-    })cpp");
-}
-
-TEST_F(DefineInlineTest, TemplateSpec) {
-  EXPECT_UNAVAILABLE(R"cpp(
-    template <typename T> void foo();
-    template<> void foo<char>();
-
-    template<> void f^oo<int>() {
-    })cpp");
-  EXPECT_UNAVAILABLE(R"cpp(
-    template <typename T> void foo();
-
-    template<> void f^oo<int>() {
-    })cpp");
-  EXPECT_UNAVAILABLE(R"cpp(
-    template <typename T> struct Foo { void foo(); };
-
-    template <typename T> void Foo<T>::f^oo() {
-    })cpp");
-  EXPECT_AVAILABLE(R"cpp(
-    template <typename T> void foo();
-    void bar();
-    template <> void foo<int>();
-
-    template<> void f^oo<int>() {
-      bar();
-    })cpp");
-  EXPECT_UNAVAILABLE(R"cpp(
-    namespace bar {
-      template <typename T> void f^oo() {}
-      template void foo<int>();
-    })cpp");
-}
-
-TEST_F(DefineInlineTest, CheckForCanonDecl) {
-  EXPECT_UNAVAILABLE(R"cpp(
-    void foo();
-
-    void bar() {}
-    void f^oo() {
-      // This bar normally refers to the definition just above, but it is not
-      // visible from the forward declaration of foo.
-      bar();
-    })cpp");
-  // Make it available with a forward decl.
-  EXPECT_AVAILABLE(R"cpp(
-    void bar();
-    void foo();
-
-    void bar() {}
-    void f^oo() {
-      bar();
-    })cpp");
-}
-
-TEST_F(DefineInlineTest, UsingShadowDecls) {
-  // Template body is not parsed until instantiation time on windows, which
-  // results in arbitrary failures as function body becomes NULL.
-  ExtraArgs.push_back("-fno-delayed-template-parsing");
-  EXPECT_UNAVAILABLE(R"cpp(
-  namespace ns1 { void foo(int); }
-  namespace ns2 { void foo(int*); }
-  template <typename T>
-  void bar();
-
-  using ns1::foo;
-  using ns2::foo;
-
-  template <typename T>
-  void b^ar() {
-    foo(T());
-  })cpp");
-}
-
-TEST_F(DefineInlineTest, TransformNestedNamespaces) {
-  auto Test = R"cpp(
-    namespace a {
-      void bar();
-      namespace b {
-        void baz();
-        namespace c {
-          void aux();
-        }
-      }
-    }
-
-    void foo();
-    using namespace a;
-    using namespace b;
-    using namespace c;
-    void f^oo() {
-      bar();
-      a::bar();
-
-      baz();
-      b::baz();
-      a::b::baz();
-
-      aux();
-      c::aux();
-      b::c::aux();
-      a::b::c::aux();
-    })cpp";
-  auto Expected = R"cpp(
-    namespace a {
-      void bar();
-      namespace b {
-        void baz();
-        namespace c {
-          void aux();
-        }
-      }
-    }
-
-    void foo(){
-      a::bar();
-      a::bar();
-
-      a::b::baz();
-      a::b::baz();
-      a::b::baz();
-
-      a::b::c::aux();
-      a::b::c::aux();
-      a::b::c::aux();
-      a::b::c::aux();
-    }
-    using namespace a;
-    using namespace b;
-    using namespace c;
-    )cpp";
-  EXPECT_EQ(apply(Test), Expected);
-}
-
-TEST_F(DefineInlineTest, TransformUsings) {
-  auto Test = R"cpp(
-    namespace a { namespace b { namespace c { void aux(); } } }
-
-    void foo();
-    void f^oo() {
-      using namespace a;
-      using namespace b;
-      using namespace c;
-      using c::aux;
-      namespace d = c;
-    })cpp";
-  auto Expected = R"cpp(
-    namespace a { namespace b { namespace c { void aux(); } } }
-
-    void foo(){
-      using namespace a;
-      using namespace a::b;
-      using namespace a::b::c;
-      using a::b::c::aux;
-      namespace d = a::b::c;
-    }
-    )cpp";
-  EXPECT_EQ(apply(Test), Expected);
-}
-
-TEST_F(DefineInlineTest, TransformDecls) {
-  auto Test = R"cpp(
-    void foo();
-    void f^oo() {
-      class Foo {
-      public:
-        void foo();
-        int x;
-      };
-
-      enum En { Zero, One };
-      En x = Zero;
-
-      enum class EnClass { Zero, One };
-      EnClass y = EnClass::Zero;
-    })cpp";
-  auto Expected = R"cpp(
-    void foo(){
-      class Foo {
-      public:
-        void foo();
-        int x;
-      };
-
-      enum En { Zero, One };
-      En x = Zero;
-
-      enum class EnClass { Zero, One };
-      EnClass y = EnClass::Zero;
-    }
-    )cpp";
-  EXPECT_EQ(apply(Test), Expected);
-}
-
-TEST_F(DefineInlineTest, TransformTemplDecls) {
-  auto Test = R"cpp(
-    namespace a {
-      template <typename T> class Bar {
-      public:
-        void bar();
-      };
-      template <typename T> T bar;
-      template <typename T> void aux() {}
-    }
-
-    void foo();
-
-    using namespace a;
-    void f^oo() {
-      bar<Bar<int>>.bar();
-      aux<Bar<int>>();
-    })cpp";
-  auto Expected = R"cpp(
-    namespace a {
-      template <typename T> class Bar {
-      public:
-        void bar();
-      };
-      template <typename T> T bar;
-      template <typename T> void aux() {}
-    }
-
-    void foo(){
-      a::bar<a::Bar<int>>.bar();
-      a::aux<a::Bar<int>>();
-    }
-
-    using namespace a;
-    )cpp";
-  EXPECT_EQ(apply(Test), Expected);
-}
-
-TEST_F(DefineInlineTest, TransformMembers) {
-  auto Test = R"cpp(
-    class Foo {
-      void foo();
-    };
-
-    void Foo::f^oo() {
-      return;
-    })cpp";
-  auto Expected = R"cpp(
-    class Foo {
-      void foo(){
-      return;
-    }
-    };
-
-    )cpp";
-  EXPECT_EQ(apply(Test), Expected);
-
-  ExtraFiles["a.h"] = R"cpp(
-    class Foo {
-      void foo();
-    };)cpp";
-
-  llvm::StringMap<std::string> EditedFiles;
-  Test = R"cpp(
-    #include "a.h"
-    void Foo::f^oo() {
-      return;
-    })cpp";
-  Expected = R"cpp(
-    #include "a.h"
-    )cpp";
-  EXPECT_EQ(apply(Test, &EditedFiles), Expected);
-
-  Expected = R"cpp(
-    class Foo {
-      void foo(){
-      return;
-    }
-    };)cpp";
-  EXPECT_THAT(EditedFiles,
-              ElementsAre(FileWithContents(testPath("a.h"), Expected)));
-}
-
-TEST_F(DefineInlineTest, TransformDependentTypes) {
-  auto Test = R"cpp(
-    namespace a {
-      template <typename T> class Bar {};
-    }
-
-    template <typename T>
-    void foo();
-
-    using namespace a;
-    template <typename T>
-    void f^oo() {
-      Bar<T> B;
-      Bar<Bar<T>> q;
-    })cpp";
-  auto Expected = R"cpp(
-    namespace a {
-      template <typename T> class Bar {};
-    }
-
-    template <typename T>
-    void foo(){
-      a::Bar<T> B;
-      a::Bar<a::Bar<T>> q;
-    }
-
-    using namespace a;
-    )cpp";
-
-  // Template body is not parsed until instantiation time on windows, which
-  // results in arbitrary failures as function body becomes NULL.
-  ExtraArgs.push_back("-fno-delayed-template-parsing");
-  EXPECT_EQ(apply(Test), Expected);
-}
-
-TEST_F(DefineInlineTest, TransformFunctionTempls) {
-  // Check we select correct specialization decl.
-  std::pair<llvm::StringRef, llvm::StringRef> Cases[] = {
-      {R"cpp(
-          template <typename T>
-          void foo(T p);
-
-          template <>
-          void foo<int>(int p);
-
-          template <>
-          void foo<char>(char p);
-
-          template <>
-          void fo^o<int>(int p) {
-            return;
-          })cpp",
-       R"cpp(
-          template <typename T>
-          void foo(T p);
-
-          template <>
-          void foo<int>(int p){
-            return;
-          }
-
-          template <>
-          void foo<char>(char p);
-
-          )cpp"},
-      {// Make sure we are not selecting the first specialization all the time.
-       R"cpp(
-          template <typename T>
-          void foo(T p);
-
-          template <>
-          void foo<int>(int p);
-
-          template <>
-          void foo<char>(char p);
-
-          template <>
-          void fo^o<char>(char p) {
-            return;
-          })cpp",
-       R"cpp(
-          template <typename T>
-          void foo(T p);
-
-          template <>
-          void foo<int>(int p);
-
-          template <>
-          void foo<char>(char p){
-            return;
-          }
-
-          )cpp"},
-      {R"cpp(
-          template <typename T>
-          void foo(T p);
-
-          template <>
-          void foo<int>(int p);
-
-          template <typename T>
-          void fo^o(T p) {
-            return;
-          })cpp",
-       R"cpp(
-          template <typename T>
-          void foo(T p){
-            return;
-          }
-
-          template <>
-          void foo<int>(int p);
-
-          )cpp"},
-  };
-  // Template body is not parsed until instantiation time on windows, which
-  // results in arbitrary failures as function body becomes NULL.
-  ExtraArgs.push_back("-fno-delayed-template-parsing");
-  for (const auto &Case : Cases)
-    EXPECT_EQ(apply(Case.first), Case.second) << Case.first;
-}
-
-TEST_F(DefineInlineTest, TransformTypeLocs) {
-  auto Test = R"cpp(
-    namespace a {
-      template <typename T> class Bar {
-      public:
-        template <typename Q> class Baz {};
-      };
-      class Foo{};
-    }
-
-    void foo();
-
-    using namespace a;
-    void f^oo() {
-      Bar<int> B;
-      Foo foo;
-      a::Bar<Bar<int>>::Baz<Bar<int>> q;
-    })cpp";
-  auto Expected = R"cpp(
-    namespace a {
-      template <typename T> class Bar {
-      public:
-        template <typename Q> class Baz {};
-      };
-      class Foo{};
-    }
-
-    void foo(){
-      a::Bar<int> B;
-      a::Foo foo;
-      a::Bar<a::Bar<int>>::Baz<a::Bar<int>> q;
-    }
-
-    using namespace a;
-    )cpp";
-  EXPECT_EQ(apply(Test), Expected);
-}
-
-TEST_F(DefineInlineTest, TransformDeclRefs) {
-  auto Test = R"cpp(
-    namespace a {
-      template <typename T> class Bar {
-      public:
-        void foo();
-        static void bar();
-        int x;
-        static int y;
-      };
-      void bar();
-      void test();
-    }
-
-    void foo();
-    using namespace a;
-    void f^oo() {
-      a::Bar<int> B;
-      B.foo();
-      a::bar();
-      Bar<Bar<int>>::bar();
-      a::Bar<int>::bar();
-      B.x = Bar<int>::y;
-      Bar<int>::y = 3;
-      bar();
-      a::test();
-    })cpp";
-  auto Expected = R"cpp(
-    namespace a {
-      template <typename T> class Bar {
-      public:
-        void foo();
-        static void bar();
-        int x;
-        static int y;
-      };
-      void bar();
-      void test();
-    }
-
-    void foo(){
-      a::Bar<int> B;
-      B.foo();
-      a::bar();
-      a::Bar<a::Bar<int>>::bar();
-      a::Bar<int>::bar();
-      B.x = a::Bar<int>::y;
-      a::Bar<int>::y = 3;
-      a::bar();
-      a::test();
-    }
-    using namespace a;
-    )cpp";
-  EXPECT_EQ(apply(Test), Expected);
-}
-
-TEST_F(DefineInlineTest, StaticMembers) {
-  auto Test = R"cpp(
-    namespace ns { class X { static void foo(); void bar(); }; }
-    void ns::X::b^ar() {
-      foo();
-    })cpp";
-  auto Expected = R"cpp(
-    namespace ns { class X { static void foo(); void bar(){
-      foo();
-    } }; }
-    )cpp";
-  EXPECT_EQ(apply(Test), Expected);
-}
-
-TEST_F(DefineInlineTest, TransformParamNames) {
-  std::pair<llvm::StringRef, llvm::StringRef> Cases[] = {
-      {R"cpp(
-        void foo(int, bool b, int T\
-est);
-        void ^foo(int f, bool x, int z) {})cpp",
-       R"cpp(
-        void foo(int f, bool x, int z){}
-        )cpp"},
-      {R"cpp(
-        #define PARAM int Z
-        void foo(PARAM);
-
-        void ^foo(int X) {})cpp",
-       "fail: Cant rename parameter inside macro body."},
-      {R"cpp(
-        #define TYPE int
-        #define PARAM TYPE Z
-        #define BODY(x) 5 * (x) + 2
-        template <int P>
-        void foo(PARAM, TYPE Q, TYPE, TYPE W = BODY(P));
-        template <int x>
-        void ^foo(int Z, int b, int c, int d) {})cpp",
-       R"cpp(
-        #define TYPE int
-        #define PARAM TYPE Z
-        #define BODY(x) 5 * (x) + 2
-        template <int x>
-        void foo(PARAM, TYPE b, TYPE c, TYPE d = BODY(x)){}
-        )cpp"},
-  };
-  ExtraArgs.push_back("-fno-delayed-template-parsing");
-  for (const auto &Case : Cases)
-    EXPECT_EQ(apply(Case.first), Case.second) << Case.first;
-}
-
-TEST_F(DefineInlineTest, TransformTemplParamNames) {
-  auto Test = R"cpp(
-    struct Foo {
-      struct Bar {
-        template <class, class X,
-                  template<typename> class, template<typename> class Y,
-                  int, int Z>
-        void foo(X, Y<X>, int W = 5 * Z + 2);
-      };
-    };
-
-    template <class T, class U,
-              template<typename> class V, template<typename> class W,
-              int X, int Y>
-    void Foo::Bar::f^oo(U, W<U>, int Q) {})cpp";
-  auto Expected = R"cpp(
-    struct Foo {
-      struct Bar {
-        template <class T, class U,
-                  template<typename> class V, template<typename> class W,
-                  int X, int Y>
-        void foo(U, W<U>, int Q = 5 * Y + 2){}
-      };
-    };
-
-    )cpp";
-  ExtraArgs.push_back("-fno-delayed-template-parsing");
-  EXPECT_EQ(apply(Test), Expected);
-}
-
-TEST_F(DefineInlineTest, TransformInlineNamespaces) {
-  auto Test = R"cpp(
-    namespace a { inline namespace b { namespace { struct Foo{}; } } }
-    void foo();
-
-    using namespace a;
-    void ^foo() {Foo foo;})cpp";
-  auto Expected = R"cpp(
-    namespace a { inline namespace b { namespace { struct Foo{}; } } }
-    void foo(){a::Foo foo;}
-
-    using namespace a;
-    )cpp";
-  EXPECT_EQ(apply(Test), Expected);
-}
-
-TEST_F(DefineInlineTest, TokensBeforeSemicolon) {
-  std::pair<llvm::StringRef, llvm::StringRef> Cases[] = {
-      {R"cpp(
-          void foo()    /*Comment -_-*/ /*Com 2*/ ;
-          void fo^o() { return ; })cpp",
-       R"cpp(
-          void foo()    /*Comment -_-*/ /*Com 2*/ { return ; }
-          )cpp"},
-
-      {R"cpp(
-          void foo();
-          void fo^o() { return ; })cpp",
-       R"cpp(
-          void foo(){ return ; }
-          )cpp"},
-
-      {R"cpp(
-          #define SEMI ;
-          void foo() SEMI
-          void fo^o() { return ; })cpp",
-       "fail: Couldn't find semicolon for target declaration."},
-  };
-  for (const auto &Case : Cases)
-    EXPECT_EQ(apply(Case.first), Case.second) << Case.first;
-}
-
-TEST_F(DefineInlineTest, HandleMacros) {
-  EXPECT_UNAVAILABLE(R"cpp(
-    #define BODY { return; }
-    void foo();
-    void f^oo()BODY)cpp");
-
-  EXPECT_UNAVAILABLE(R"cpp(
-    #define BODY void foo(){ return; }
-    void foo();
-    [[BODY]])cpp");
-
-  std::pair<llvm::StringRef, llvm::StringRef> Cases[] = {
-      // We don't qualify declarations coming from macros.
-      {R"cpp(
-          #define BODY Foo
-          namespace a { class Foo{}; }
-          void foo();
-          using namespace a;
-          void f^oo(){BODY();})cpp",
-       R"cpp(
-          #define BODY Foo
-          namespace a { class Foo{}; }
-          void foo(){BODY();}
-          using namespace a;
-          )cpp"},
-
-      // Macro is not visible at declaration location, but we proceed.
-      {R"cpp(
-          void foo();
-          #define BODY return;
-          void f^oo(){BODY})cpp",
-       R"cpp(
-          void foo(){BODY}
-          #define BODY return;
-          )cpp"},
-
-      {R"cpp(
-          #define TARGET void foo()
-          TARGET;
-          void f^oo(){ return; })cpp",
-       R"cpp(
-          #define TARGET void foo()
-          TARGET{ return; }
-          )cpp"},
-
-      {R"cpp(
-          #define TARGET foo
-          void TARGET();
-          void f^oo(){ return; })cpp",
-       R"cpp(
-          #define TARGET foo
-          void TARGET(){ return; }
-          )cpp"},
-  };
-  for (const auto &Case : Cases)
-    EXPECT_EQ(apply(Case.first), Case.second) << Case.first;
-}
-
-TEST_F(DefineInlineTest, DropCommonNameSpecifiers) {
-  struct {
-    llvm::StringRef Test;
-    llvm::StringRef Expected;
-  } Cases[] = {
-      {R"cpp(
-        namespace a { namespace b { void aux(); } }
-        namespace ns1 {
-          void foo();
-          namespace qq { void test(); }
-          namespace ns2 {
-            void bar();
-            namespace ns3 { void baz(); }
-          }
-        }
-
-        using namespace a;
-        using namespace a::b;
-        using namespace ns1::qq;
-        void ns1::ns2::ns3::b^az() {
-          foo();
-          bar();
-          baz();
-          ns1::ns2::ns3::baz();
-          aux();
-          test();
-        })cpp",
-       R"cpp(
-        namespace a { namespace b { void aux(); } }
-        namespace ns1 {
-          void foo();
-          namespace qq { void test(); }
-          namespace ns2 {
-            void bar();
-            namespace ns3 { void baz(){
-          foo();
-          bar();
-          baz();
-          ns1::ns2::ns3::baz();
-          a::b::aux();
-          qq::test();
-        } }
-          }
-        }
-
-        using namespace a;
-        using namespace a::b;
-        using namespace ns1::qq;
-        )cpp"},
-      {R"cpp(
-        namespace ns1 {
-          namespace qq { struct Foo { struct Bar {}; }; using B = Foo::Bar; }
-          namespace ns2 { void baz(); }
-        }
-
-        using namespace ns1::qq;
-        void ns1::ns2::b^az() { Foo f; B b; })cpp",
-       R"cpp(
-        namespace ns1 {
-          namespace qq { struct Foo { struct Bar {}; }; using B = Foo::Bar; }
-          namespace ns2 { void baz(){ qq::Foo f; qq::B b; } }
-        }
-
-        using namespace ns1::qq;
-        )cpp"},
-      {R"cpp(
-        namespace ns1 {
-          namespace qq {
-            template<class T> struct Foo { template <class U> struct Bar {}; };
-            template<class T, class U>
-            using B = typename Foo<T>::template Bar<U>;
-          }
-          namespace ns2 { void baz(); }
-        }
-
-        using namespace ns1::qq;
-        void ns1::ns2::b^az() { B<int, bool> b; })cpp",
-       R"cpp(
-        namespace ns1 {
-          namespace qq {
-            template<class T> struct Foo { template <class U> struct Bar {}; };
-            template<class T, class U>
-            using B = typename Foo<T>::template Bar<U>;
-          }
-          namespace ns2 { void baz(){ qq::B<int, bool> b; } }
-        }
-
-        using namespace ns1::qq;
-        )cpp"},
-  };
-  for (const auto &Case : Cases)
-    EXPECT_EQ(apply(Case.Test), Case.Expected) << Case.Test;
-}
-
-TEST_F(DefineInlineTest, QualifyWithUsingDirectives) {
-  llvm::StringRef Test = R"cpp(
-    namespace a {
-      void bar();
-      namespace b { struct Foo{}; void aux(); }
-      namespace c { void cux(); }
-    }
-    using namespace a;
-    using X = b::Foo;
-    void foo();
-
-    using namespace b;
-    using namespace c;
-    void ^foo() {
-      cux();
-      bar();
-      X x;
-      aux();
-      using namespace c;
-      // FIXME: The last reference to cux() in body of foo should not be
-      // qualified, since there is a using directive inside the function body.
-      cux();
-    })cpp";
-  llvm::StringRef Expected = R"cpp(
-    namespace a {
-      void bar();
-      namespace b { struct Foo{}; void aux(); }
-      namespace c { void cux(); }
-    }
-    using namespace a;
-    using X = b::Foo;
-    void foo(){
-      c::cux();
-      bar();
-      X x;
-      b::aux();
-      using namespace c;
-      // FIXME: The last reference to cux() in body of foo should not be
-      // qualified, since there is a using directive inside the function body.
-      c::cux();
-    }
-
-    using namespace b;
-    using namespace c;
-    )cpp";
-  EXPECT_EQ(apply(Test), Expected) << Test;
-}
-
-TEST_F(DefineInlineTest, AddInline) {
-  ExtraArgs.push_back("-fno-delayed-template-parsing");
-  llvm::StringMap<std::string> EditedFiles;
-  ExtraFiles["a.h"] = "void foo();";
-  apply(R"cpp(#include "a.h"
-              void fo^o() {})cpp",
-        &EditedFiles);
-  EXPECT_THAT(EditedFiles, testing::ElementsAre(FileWithContents(
-                               testPath("a.h"), "inline void foo(){}")));
-
-  // Check we put inline before cv-qualifiers.
-  ExtraFiles["a.h"] = "const int foo();";
-  apply(R"cpp(#include "a.h"
-              const int fo^o() {})cpp",
-        &EditedFiles);
-  EXPECT_THAT(EditedFiles, testing::ElementsAre(FileWithContents(
-                               testPath("a.h"), "inline const int foo(){}")));
-
-  // No double inline.
-  ExtraFiles["a.h"] = "inline void foo();";
-  apply(R"cpp(#include "a.h"
-              inline void fo^o() {})cpp",
-        &EditedFiles);
-  EXPECT_THAT(EditedFiles, testing::ElementsAre(FileWithContents(
-                               testPath("a.h"), "inline void foo(){}")));
-
-  // Constexprs don't need "inline".
-  ExtraFiles["a.h"] = "constexpr void foo();";
-  apply(R"cpp(#include "a.h"
-              constexpr void fo^o() {})cpp",
-        &EditedFiles);
-  EXPECT_THAT(EditedFiles, testing::ElementsAre(FileWithContents(
-                               testPath("a.h"), "constexpr void foo(){}")));
-
-  // Class members don't need "inline".
-  ExtraFiles["a.h"] = "struct Foo { void foo(); };";
-  apply(R"cpp(#include "a.h"
-              void Foo::fo^o() {})cpp",
-        &EditedFiles);
-  EXPECT_THAT(EditedFiles,
-              testing::ElementsAre(FileWithContents(
-                  testPath("a.h"), "struct Foo { void foo(){} };")));
-
-  // Function template doesn't need to be "inline"d.
-  ExtraFiles["a.h"] = "template <typename T> void foo();";
-  apply(R"cpp(#include "a.h"
-              template <typename T>
-              void fo^o() {})cpp",
-        &EditedFiles);
-  EXPECT_THAT(EditedFiles,
-              testing::ElementsAre(FileWithContents(
-                  testPath("a.h"), "template <typename T> void foo(){}")));
-
-  // Specializations needs to be marked "inline".
-  ExtraFiles["a.h"] = R"cpp(
-                            template <typename T> void foo();
-                            template <> void foo<int>();)cpp";
-  apply(R"cpp(#include "a.h"
-              template <>
-              void fo^o<int>() {})cpp",
-        &EditedFiles);
-  EXPECT_THAT(EditedFiles,
-              testing::ElementsAre(FileWithContents(testPath("a.h"),
-                                                    R"cpp(
-                            template <typename T> void foo();
-                            template <> inline void foo<int>(){})cpp")));
-}
-
-TWEAK_TEST(DefineOutline);
-TEST_F(DefineOutlineTest, TriggersOnFunctionDecl) {
-  FileName = "Test.cpp";
-  // Not available unless in a header file.
-  EXPECT_UNAVAILABLE(R"cpp(
-    [[void [[f^o^o]]() [[{
-      return;
-    }]]]])cpp");
-
-  FileName = "Test.hpp";
-  // Not available unless function name or fully body is selected.
-  EXPECT_UNAVAILABLE(R"cpp(
-    // Not a definition
-    vo^i[[d^ ^f]]^oo();
-
-    [[vo^id ]]foo[[()]] {[[
-      [[(void)(5+3);
-      return;]]
-    }]])cpp");
-
-  // Available even if there are no implementation files.
-  EXPECT_AVAILABLE(R"cpp(
-    [[void [[f^o^o]]() [[{
-      return;
-    }]]]])cpp");
-
-  // Not available for out-of-line methods.
-  EXPECT_UNAVAILABLE(R"cpp(
-    class Bar {
-      void baz();
-    };
-
-    [[void [[Bar::[[b^a^z]]]]() [[{
-      return;
-    }]]]])cpp");
-
-  // Basic check for function body and signature.
-  EXPECT_AVAILABLE(R"cpp(
-    class Bar {
-      [[void [[f^o^o^]]() [[{ return; }]]]]
-    };
-
-    void foo();
-    [[void [[f^o^o]]() [[{
-      return;
-    }]]]])cpp");
-
-  // Not available on defaulted/deleted members.
-  EXPECT_UNAVAILABLE(R"cpp(
-    class Foo {
-      Fo^o() = default;
-      F^oo(const Foo&) = delete;
-    };)cpp");
-
-  // Not available within templated classes, as it is hard to spell class name
-  // out-of-line in such cases.
-  EXPECT_UNAVAILABLE(R"cpp(
-    template <typename> struct Foo { void fo^o(){} };
-    )cpp");
-
-  // Not available on function templates and specializations, as definition must
-  // be visible to all translation units.
-  EXPECT_UNAVAILABLE(R"cpp(
-    template <typename> void fo^o() {};
-    template <> void fo^o<int>() {};
-  )cpp");
-}
-
-TEST_F(DefineOutlineTest, FailsWithoutSource) {
-  FileName = "Test.hpp";
-  llvm::StringRef Test = "void fo^o() { return; }";
-  llvm::StringRef Expected =
-      "fail: Couldn't find a suitable implementation file.";
-  EXPECT_EQ(apply(Test), Expected);
-}
-
-TEST_F(DefineOutlineTest, ApplyTest) {
-  llvm::StringMap<std::string> EditedFiles;
-  ExtraFiles["Test.cpp"] = "";
-  FileName = "Test.hpp";
-  // Template body is not parsed until instantiation time on windows, which
-  // results in arbitrary failures as function body becomes NULL.
-  ExtraArgs.push_back("-fno-delayed-template-parsing");
-
-  struct {
-    llvm::StringRef Test;
-    llvm::StringRef ExpectedHeader;
-    llvm::StringRef ExpectedSource;
-  } Cases[] = {
-      // Simple check
-      {
-          "void fo^o() { return; }",
-          "void foo() ;",
-          "void foo() { return; }",
-      },
-      // Default args.
-      {
-          "void fo^o(int x, int y = 5, int = 2, int (*foo)(int) = nullptr) {}",
-          "void foo(int x, int y = 5, int = 2, int (*foo)(int) = nullptr) ;",
-          "void foo(int x, int y , int , int (*foo)(int) ) {}",
-      },
-      // Constructors
-      {
-          R"cpp(
-            class Foo {public: Foo(); Foo(int);};
-            class Bar {
-              Ba^r() {}
-              Bar(int x) : f1(x) {}
-              Foo f1;
-              Foo f2 = 2;
-            };)cpp",
-          R"cpp(
-            class Foo {public: Foo(); Foo(int);};
-            class Bar {
-              Bar() ;
-              Bar(int x) : f1(x) {}
-              Foo f1;
-              Foo f2 = 2;
-            };)cpp",
-          "Bar::Bar() {}\n",
-      },
-      // Ctor with initializer.
-      {
-          R"cpp(
-            class Foo {public: Foo(); Foo(int);};
-            class Bar {
-              Bar() {}
-              B^ar(int x) : f1(x), f2(3) {}
-              Foo f1;
-              Foo f2 = 2;
-            };)cpp",
-          R"cpp(
-            class Foo {public: Foo(); Foo(int);};
-            class Bar {
-              Bar() {}
-              Bar(int x) ;
-              Foo f1;
-              Foo f2 = 2;
-            };)cpp",
-          "Bar::Bar(int x) : f1(x), f2(3) {}\n",
-      },
-      // Ctor initializer with attribute.
-      {
-          R"cpp(
-              class Foo {
-                F^oo(int z) __attribute__((weak)) : bar(2){}
-                int bar;
-              };)cpp",
-          R"cpp(
-              class Foo {
-                Foo(int z) __attribute__((weak)) ;
-                int bar;
-              };)cpp",
-          "Foo::Foo(int z) __attribute__((weak)) : bar(2){}\n",
-      },
-      // Virt specifiers.
-      {
-          R"cpp(
-            struct A {
-              virtual void f^oo() {}
-            };)cpp",
-          R"cpp(
-            struct A {
-              virtual void foo() ;
-            };)cpp",
-          " void A::foo() {}\n",
-      },
-      {
-          R"cpp(
-            struct A {
-              virtual virtual void virtual f^oo() {}
-            };)cpp",
-          R"cpp(
-            struct A {
-              virtual virtual void virtual foo() ;
-            };)cpp",
-          "  void  A::foo() {}\n",
-      },
-      {
-          R"cpp(
-            struct A {
-              virtual void foo() = 0;
-            };
-            struct B : A {
-              void fo^o() override {}
-            };)cpp",
-          R"cpp(
-            struct A {
-              virtual void foo() = 0;
-            };
-            struct B : A {
-              void foo() override ;
-            };)cpp",
-          "void B::foo()  {}\n",
-      },
-      {
-          R"cpp(
-            struct A {
-              virtual void foo() = 0;
-            };
-            struct B : A {
-              void fo^o() final {}
-            };)cpp",
-          R"cpp(
-            struct A {
-              virtual void foo() = 0;
-            };
-            struct B : A {
-              void foo() final ;
-            };)cpp",
-          "void B::foo()  {}\n",
-      },
-      {
-          R"cpp(
-            struct A {
-              virtual void foo() = 0;
-            };
-            struct B : A {
-              void fo^o() final override {}
-            };)cpp",
-          R"cpp(
-            struct A {
-              virtual void foo() = 0;
-            };
-            struct B : A {
-              void foo() final override ;
-            };)cpp",
-          "void B::foo()   {}\n",
-      },
-      {
-          R"cpp(
-            struct A {
-              static void fo^o() {}
-            };)cpp",
-          R"cpp(
-            struct A {
-              static void foo() ;
-            };)cpp",
-          " void A::foo() {}\n",
-      },
-      {
-          R"cpp(
-            struct A {
-              static static void fo^o() {}
-            };)cpp",
-          R"cpp(
-            struct A {
-              static static void foo() ;
-            };)cpp",
-          "  void A::foo() {}\n",
-      },
-  };
-  for (const auto &Case : Cases) {
-    SCOPED_TRACE(Case.Test);
-    EXPECT_EQ(apply(Case.Test, &EditedFiles), Case.ExpectedHeader);
-    EXPECT_THAT(EditedFiles, testing::ElementsAre(FileWithContents(
-                                 testPath("Test.cpp"), Case.ExpectedSource)));
-  }
-}
-
-TEST_F(DefineOutlineTest, HandleMacros) {
-  llvm::StringMap<std::string> EditedFiles;
-  ExtraFiles["Test.cpp"] = "";
-  FileName = "Test.hpp";
-  ExtraArgs.push_back("-DVIRTUAL=virtual");
-  ExtraArgs.push_back("-DOVER=override");
-
-  struct {
-    llvm::StringRef Test;
-    llvm::StringRef ExpectedHeader;
-    llvm::StringRef ExpectedSource;
-  } Cases[] = {
-      {R"cpp(
-          #define BODY { return; }
-          void f^oo()BODY)cpp",
-       R"cpp(
-          #define BODY { return; }
-          void foo();)cpp",
-       "void foo()BODY"},
-
-      {R"cpp(
-          #define BODY return;
-          void f^oo(){BODY})cpp",
-       R"cpp(
-          #define BODY return;
-          void foo();)cpp",
-       "void foo(){BODY}"},
-
-      {R"cpp(
-          #define TARGET void foo()
-          [[TARGET]]{ return; })cpp",
-       R"cpp(
-          #define TARGET void foo()
-          TARGET;)cpp",
-       "TARGET{ return; }"},
-
-      {R"cpp(
-          #define TARGET foo
-          void [[TARGET]](){ return; })cpp",
-       R"cpp(
-          #define TARGET foo
-          void TARGET();)cpp",
-       "void TARGET(){ return; }"},
-      {R"cpp(#define VIRT virtual
-          struct A {
-            VIRT void f^oo() {}
-          };)cpp",
-       R"cpp(#define VIRT virtual
-          struct A {
-            VIRT void foo() ;
-          };)cpp",
-       " void A::foo() {}\n"},
-      {R"cpp(
-          struct A {
-            VIRTUAL void f^oo() {}
-          };)cpp",
-       R"cpp(
-          struct A {
-            VIRTUAL void foo() ;
-          };)cpp",
-       " void A::foo() {}\n"},
-      {R"cpp(
-          struct A {
-            virtual void foo() = 0;
-          };
-          struct B : A {
-            void fo^o() OVER {}
-          };)cpp",
-       R"cpp(
-          struct A {
-            virtual void foo() = 0;
-          };
-          struct B : A {
-            void foo() OVER ;
-          };)cpp",
-       "void B::foo()  {}\n"},
-      {R"cpp(#define STUPID_MACRO(X) virtual
-          struct A {
-            STUPID_MACRO(sizeof sizeof int) void f^oo() {}
-          };)cpp",
-       R"cpp(#define STUPID_MACRO(X) virtual
-          struct A {
-            STUPID_MACRO(sizeof sizeof int) void foo() ;
-          };)cpp",
-       " void A::foo() {}\n"},
-      {R"cpp(#define STAT static
-          struct A {
-            STAT void f^oo() {}
-          };)cpp",
-       R"cpp(#define STAT static
-          struct A {
-            STAT void foo() ;
-          };)cpp",
-       " void A::foo() {}\n"},
-      {R"cpp(#define STUPID_MACRO(X) static
-          struct A {
-            STUPID_MACRO(sizeof sizeof int) void f^oo() {}
-          };)cpp",
-       R"cpp(#define STUPID_MACRO(X) static
-          struct A {
-            STUPID_MACRO(sizeof sizeof int) void foo() ;
-          };)cpp",
-       " void A::foo() {}\n"},
-  };
-  for (const auto &Case : Cases) {
-    SCOPED_TRACE(Case.Test);
-    EXPECT_EQ(apply(Case.Test, &EditedFiles), Case.ExpectedHeader);
-    EXPECT_THAT(EditedFiles, testing::ElementsAre(FileWithContents(
-                                 testPath("Test.cpp"), Case.ExpectedSource)));
-  }
-}
-
-TEST_F(DefineOutlineTest, QualifyReturnValue) {
-  FileName = "Test.hpp";
-  ExtraFiles["Test.cpp"] = "";
-
-  struct {
-    llvm::StringRef Test;
-    llvm::StringRef ExpectedHeader;
-    llvm::StringRef ExpectedSource;
-  } Cases[] = {
-      {R"cpp(
-        namespace a { class Foo{}; }
-        using namespace a;
-        Foo fo^o() { return {}; })cpp",
-       R"cpp(
-        namespace a { class Foo{}; }
-        using namespace a;
-        Foo foo() ;)cpp",
-       "a::Foo foo() { return {}; }"},
-      {R"cpp(
-        namespace a {
-          class Foo {
-            class Bar {};
-            Bar fo^o() { return {}; }
-          };
-        })cpp",
-       R"cpp(
-        namespace a {
-          class Foo {
-            class Bar {};
-            Bar foo() ;
-          };
-        })cpp",
-       "a::Foo::Bar a::Foo::foo() { return {}; }\n"},
-      {R"cpp(
-        class Foo {};
-        Foo fo^o() { return {}; })cpp",
-       R"cpp(
-        class Foo {};
-        Foo foo() ;)cpp",
-       "Foo foo() { return {}; }"},
-  };
-  llvm::StringMap<std::string> EditedFiles;
-  for (auto &Case : Cases) {
-    apply(Case.Test, &EditedFiles);
-    EXPECT_EQ(apply(Case.Test, &EditedFiles), Case.ExpectedHeader);
-    EXPECT_THAT(EditedFiles, testing::ElementsAre(FileWithContents(
-                                 testPath("Test.cpp"), Case.ExpectedSource)));
-  }
-}
-
-TEST_F(DefineOutlineTest, QualifyFunctionName) {
-  FileName = "Test.hpp";
-  struct {
-    llvm::StringRef TestHeader;
-    llvm::StringRef TestSource;
-    llvm::StringRef ExpectedHeader;
-    llvm::StringRef ExpectedSource;
-  } Cases[] = {
-      {
-          R"cpp(
-            namespace a {
-              namespace b {
-                class Foo {
-                  void fo^o() {}
-                };
-              }
-            })cpp",
-          "",
-          R"cpp(
-            namespace a {
-              namespace b {
-                class Foo {
-                  void foo() ;
-                };
-              }
-            })cpp",
-          "void a::b::Foo::foo() {}\n",
-      },
-      {
-          "namespace a { namespace b { void f^oo() {} } }",
-          "namespace a{}",
-          "namespace a { namespace b { void foo() ; } }",
-          "namespace a{void b::foo() {} }",
-      },
-      {
-          "namespace a { namespace b { void f^oo() {} } }",
-          "using namespace a;",
-          "namespace a { namespace b { void foo() ; } }",
-          // FIXME: Take using namespace directives in the source file into
-          // account. This can be spelled as b::foo instead.
-          "using namespace a;void a::b::foo() {} ",
-      },
-  };
-  llvm::StringMap<std::string> EditedFiles;
-  for (auto &Case : Cases) {
-    ExtraFiles["Test.cpp"] = std::string(Case.TestSource);
-    EXPECT_EQ(apply(Case.TestHeader, &EditedFiles), Case.ExpectedHeader);
-    EXPECT_THAT(EditedFiles, testing::ElementsAre(FileWithContents(
-                                 testPath("Test.cpp"), Case.ExpectedSource)))
-        << Case.TestHeader;
-  }
-}
-
-TEST_F(DefineOutlineTest, FailsMacroSpecifier) {
-  FileName = "Test.hpp";
-  ExtraFiles["Test.cpp"] = "";
-  ExtraArgs.push_back("-DFINALOVER=final override");
-
-  std::pair<StringRef, StringRef> Cases[] = {
-      {
-          R"cpp(
-          #define VIRT virtual void
-          struct A {
-            VIRT fo^o() {}
-          };)cpp",
-          "fail: define outline: couldn't remove `virtual` keyword."},
-      {
-          R"cpp(
-          #define OVERFINAL final override
-          struct A {
-            virtual void foo() {}
-          };
-          struct B : A {
-            void fo^o() OVERFINAL {}
-          };)cpp",
-          "fail: define outline: Can't move out of line as function has a "
-          "macro `override` specifier.\ndefine outline: Can't move out of line "
-          "as function has a macro `final` specifier."},
-      {
-          R"cpp(
-          struct A {
-            virtual void foo() {}
-          };
-          struct B : A {
-            void fo^o() FINALOVER {}
-          };)cpp",
-          "fail: define outline: Can't move out of line as function has a "
-          "macro `override` specifier.\ndefine outline: Can't move out of line "
-          "as function has a macro `final` specifier."},
-  };
-  for (const auto &Case : Cases) {
-    EXPECT_EQ(apply(Case.first), Case.second);
-  }
-}
-
-TWEAK_TEST(AddUsing);
-TEST_F(AddUsingTest, Prepare) {
-  Config Cfg;
-  Cfg.Style.FullyQualifiedNamespaces.push_back("ban");
-  WithContextValue WithConfig(Config::Key, std::move(Cfg));
-
-  const std::string Header = R"cpp(
-#define NS(name) one::two::name
-namespace ban { void foo() {} }
-namespace banana { void foo() {} }
-namespace one {
-void oo() {}
-template<typename TT> class tt {};
-namespace two {
-enum ee {};
-void ff() {}
-class cc {
-public:
-  struct st {};
-  static void mm() {}
-  cc operator|(const cc& x) const { return x; }
-};
-}
-})cpp";
-
-  EXPECT_AVAILABLE(Header + "void fun() { o^n^e^:^:^t^w^o^:^:^f^f(); }");
-  EXPECT_AVAILABLE(Header + "void fun() { o^n^e^::^o^o(); }");
-  EXPECT_AVAILABLE(Header + "void fun() { o^n^e^:^:^t^w^o^:^:^e^e E; }");
-  EXPECT_AVAILABLE(Header + "void fun() { o^n^e^:^:^t^w^o:^:^c^c C; }");
-  EXPECT_UNAVAILABLE(Header +
-                     "void fun() { o^n^e^:^:^t^w^o^:^:^c^c^:^:^m^m(); }");
-  EXPECT_UNAVAILABLE(Header +
-                     "void fun() { o^n^e^:^:^t^w^o^:^:^c^c^:^:^s^t inst; }");
-  EXPECT_UNAVAILABLE(Header +
-                     "void fun() { o^n^e^:^:^t^w^o^:^:^c^c^:^:^s^t inst; }");
-  EXPECT_UNAVAILABLE(Header + "void fun() { N^S(c^c) inst; }");
-  // This used to crash. Ideally we would support this case, but for now we just
-  // test that we don't crash.
-  EXPECT_UNAVAILABLE(Header +
-                     "template<typename TT> using foo = one::tt<T^T>;");
-  // Test that we don't crash or misbehave on unnamed DeclRefExpr.
-  EXPECT_UNAVAILABLE(Header +
-                     "void fun() { one::two::cc() ^| one::two::cc(); }");
-  // Do not offer code action when operating on a banned namespace.
-  EXPECT_UNAVAILABLE(Header + "void fun() { ban::fo^o(); }");
-  EXPECT_UNAVAILABLE(Header + "void fun() { ::ban::fo^o(); }");
-  EXPECT_AVAILABLE(Header + "void fun() { banana::fo^o(); }");
-
-  // Do not offer code action on typo-corrections.
-  EXPECT_UNAVAILABLE(Header + "/*error-ok*/c^c C;");
-
-  // NestedNameSpecifier, but no namespace.
-  EXPECT_UNAVAILABLE(Header + "class Foo {}; class F^oo foo;");
-
-  // Check that we do not trigger in header files.
-  FileName = "test.h";
-  ExtraArgs.push_back("-xc++-header"); // .h file is treated a C by default.
-  EXPECT_UNAVAILABLE(Header + "void fun() { one::two::f^f(); }");
-  FileName = "test.hpp";
-  EXPECT_UNAVAILABLE(Header + "void fun() { one::two::f^f(); }");
-}
-
-TEST_F(AddUsingTest, Apply) {
-  FileName = "test.cpp";
-  struct {
-    llvm::StringRef TestSource;
-    llvm::StringRef ExpectedSource;
-  } Cases[]{{
-                // Function, no other using, namespace.
-                R"cpp(
-#include "test.hpp"
-namespace {
-void fun() {
-  ^o^n^e^:^:^t^w^o^:^:^f^f();
-}
-})cpp",
-                R"cpp(
-#include "test.hpp"
-namespace {using one::two::ff;
-
-void fun() {
-  ff();
-}
-})cpp",
-            },
-            // Type, no other using, namespace.
-            {
-                R"cpp(
-#include "test.hpp"
-namespace {
-void fun() {
-  ::on^e::t^wo::c^c inst;
-}
-})cpp",
-                R"cpp(
-#include "test.hpp"
-namespace {using ::one::two::cc;
-
-void fun() {
-  cc inst;
-}
-})cpp",
-            },
-            // Type, no other using, no namespace.
-            {
-                R"cpp(
-#include "test.hpp"
-
-void fun() {
-  on^e::t^wo::e^e inst;
-})cpp",
-                R"cpp(
-#include "test.hpp"
-
-using one::two::ee;
-
-void fun() {
-  ee inst;
-})cpp"},
-            // Function, other usings.
-            {
-                R"cpp(
-#include "test.hpp"
-
-using one::two::cc;
-using one::two::ee;
-
-namespace {
-void fun() {
-  one::two::f^f();
-}
-})cpp",
-                R"cpp(
-#include "test.hpp"
-
-using one::two::cc;
-using one::two::ff;using one::two::ee;
-
-namespace {
-void fun() {
-  ff();
-}
-})cpp",
-            },
-            // Function, other usings inside namespace.
-            {
-                R"cpp(
-#include "test.hpp"
-
-using one::two::cc;
-
-namespace {
-
-using one::two::ff;
-
-void fun() {
-  o^ne::o^o();
-}
-})cpp",
-                R"cpp(
-#include "test.hpp"
-
-using one::two::cc;
-
-namespace {
-
-using one::oo;using one::two::ff;
-
-void fun() {
-  oo();
-}
-})cpp"},
-            // Using comes after cursor.
-            {
-                R"cpp(
-#include "test.hpp"
-
-namespace {
-
-void fun() {
-  one::t^wo::ff();
-}
-
-using one::two::cc;
-
-})cpp",
-                R"cpp(
-#include "test.hpp"
-
-namespace {using one::two::ff;
-
-
-void fun() {
-  ff();
-}
-
-using one::two::cc;
-
-})cpp"},
-            // Pointer type.
-            {R"cpp(
-#include "test.hpp"
-
-void fun() {
-  one::two::c^c *p;
-})cpp",
-             R"cpp(
-#include "test.hpp"
-
-using one::two::cc;
-
-void fun() {
-  cc *p;
-})cpp"},
-            // Namespace declared via macro.
-            {R"cpp(
-#include "test.hpp"
-#define NS_BEGIN(name) namespace name {
-
-NS_BEGIN(foo)
-
-void fun() {
-  one::two::f^f();
-}
-})cpp",
-             R"cpp(
-#include "test.hpp"
-#define NS_BEGIN(name) namespace name {
-
-using one::two::ff;
-
-NS_BEGIN(foo)
-
-void fun() {
-  ff();
-}
-})cpp"},
-            // Inside macro argument.
-            {R"cpp(
-#include "test.hpp"
-#define CALL(name) name()
-
-void fun() {
-  CALL(one::t^wo::ff);
-})cpp",
-             R"cpp(
-#include "test.hpp"
-#define CALL(name) name()
-
-using one::two::ff;
-
-void fun() {
-  CALL(ff);
-})cpp"},
-            // Parent namespace != lexical parent namespace
-            {R"cpp(
-#include "test.hpp"
-namespace foo { void fun(); }
-
-void foo::fun() {
-  one::two::f^f();
-})cpp",
-             R"cpp(
-#include "test.hpp"
-using one::two::ff;
-
-namespace foo { void fun(); }
-
-void foo::fun() {
-  ff();
-})cpp"},
-            // If all other using are fully qualified, add ::
-            {R"cpp(
-#include "test.hpp"
-
-using ::one::two::cc;
-using ::one::two::ee;
-
-void fun() {
-  one::two::f^f();
-})cpp",
-             R"cpp(
-#include "test.hpp"
-
-using ::one::two::cc;
-using ::one::two::ff;using ::one::two::ee;
-
-void fun() {
-  ff();
-})cpp"},
-            // Make sure we don't add :: if it's already there
-            {R"cpp(
-#include "test.hpp"
-
-using ::one::two::cc;
-using ::one::two::ee;
-
-void fun() {
-  ::one::two::f^f();
-})cpp",
-             R"cpp(
-#include "test.hpp"
-
-using ::one::two::cc;
-using ::one::two::ff;using ::one::two::ee;
-
-void fun() {
-  ff();
-})cpp"},
-            // If even one using doesn't start with ::, do not add it
-            {R"cpp(
-#include "test.hpp"
-
-using ::one::two::cc;
-using one::two::ee;
-
-void fun() {
-  one::two::f^f();
-})cpp",
-             R"cpp(
-#include "test.hpp"
-
-using ::one::two::cc;
-using one::two::ff;using one::two::ee;
-
-void fun() {
-  ff();
-})cpp"},
-            // using alias; insert using for the spelled name.
-            {R"cpp(
-#include "test.hpp"
-
-void fun() {
-  one::u^u u;
-})cpp",
-             R"cpp(
-#include "test.hpp"
-
-using one::uu;
-
-void fun() {
-  uu u;
-})cpp"},
-            // using namespace.
-            {R"cpp(
-#include "test.hpp"
-using namespace one;
-namespace {
-two::c^c C;
-})cpp",
-             R"cpp(
-#include "test.hpp"
-using namespace one;
-namespace {using two::cc;
-
-cc C;
-})cpp"},
-            // Type defined in main file, make sure using is after that.
-            {R"cpp(
-namespace xx {
-  struct yy {};
-}
-
-x^x::yy X;
-)cpp",
-             R"cpp(
-namespace xx {
-  struct yy {};
-}
-
-using xx::yy;
-
-yy X;
-)cpp"},
-            // Type defined in main file via "using", insert after that.
-            {R"cpp(
-#include "test.hpp"
-
-namespace xx {
-  using yy = one::two::cc;
-}
-
-x^x::yy X;
-)cpp",
-             R"cpp(
-#include "test.hpp"
-
-namespace xx {
-  using yy = one::two::cc;
-}
-
-using xx::yy;
-
-yy X;
-)cpp"},
-            // Using must come after function definition.
-            {R"cpp(
-namespace xx {
-  void yy();
-}
-
-void fun() {
-  x^x::yy();
-}
-)cpp",
-             R"cpp(
-namespace xx {
-  void yy();
-}
-
-using xx::yy;
-
-void fun() {
-  yy();
-}
-)cpp"},
-            // Existing using with non-namespace part.
-            {R"cpp(
-#include "test.hpp"
-using one::two::ee::ee_one;
-one::t^wo::cc c;
-)cpp",
-             R"cpp(
-#include "test.hpp"
-using one::two::cc;using one::two::ee::ee_one;
-cc c;
-)cpp"}};
-  llvm::StringMap<std::string> EditedFiles;
-  for (const auto &Case : Cases) {
-    for (const auto &SubCase : expandCases(Case.TestSource)) {
-      ExtraFiles["test.hpp"] = R"cpp(
-namespace one {
-void oo() {}
-namespace two {
-enum ee {ee_one};
-void ff() {}
-class cc {
-public:
-  struct st { struct nested {}; };
-  static void mm() {}
-};
-}
-using uu = two::cc;
-})cpp";
-      EXPECT_EQ(apply(SubCase, &EditedFiles), Case.ExpectedSource);
-    }
-  }
-}
-
-TWEAK_TEST(PopulateSwitch);
-TEST_F(PopulateSwitchTest, Test) {
-  struct Case {
-    CodeContext Context;
-    llvm::StringRef TestSource;
-    llvm::StringRef ExpectedSource;
-  };
-
-  Case Cases[]{
-      {
-          // No enumerators
-          Function,
-          R""(enum Enum {}; ^switch ((Enum)0) {})"",
-          "unavailable",
-      },
-      {
-          // All enumerators already in switch (unscoped)
-          Function,
-          R""(enum Enum {A,B}; ^switch (A) {case A:break;case B:break;})"",
-          "unavailable",
-      },
-      {
-          // All enumerators already in switch (scoped)
-          Function,
-          R""(
-            enum class Enum {A,B};
-            ^switch (Enum::A) {case Enum::A:break;case Enum::B:break;}
-          )"",
-          "unavailable",
-      },
-      {
-          // Default case in switch
-          Function,
-          R""(
-            enum class Enum {A,B};
-            ^switch (Enum::A) {default:break;}
-          )"",
-          "unavailable",
-      },
-      {
-          // GNU range in switch
-          Function,
-          R""(
-            enum class Enum {A,B};
-            ^switch (Enum::A) {case Enum::A ... Enum::B:break;}
-          )"",
-          "unavailable",
-      },
-      {
-          // Value dependent case expression
-          File,
-          R""(
-            enum class Enum {A,B};
-            template<Enum Value>
-            void function() {
-                ^switch (Enum::A) {case Value:break;}
-            }
-          )"",
-          "unavailable",
-      },
-      {
-          // Body not CompoundStmt
-          Function,
-          R""(enum Enum {A}; ^switch (A);)"",
-          "unavailable",
-      },
-      {
-          // Selection on switch token
-          Function,
-          R""(enum Enum {A}; ^switch (A) {})"",
-          R""(enum Enum {A}; switch (A) {case A:break;})"",
-      },
-      {
-          // Selection on switch condition
-          Function,
-          R""(enum Enum {A}; switch (^A) {})"",
-          R""(enum Enum {A}; switch (A) {case A:break;})"",
-      },
-      {
-          // Selection in switch body
-          Function,
-          R""(enum Enum {A}; switch (A) {^})"",
-          R""(enum Enum {A}; switch (A) {case A:break;})"",
-      },
-      {
-          // Scoped enumeration
-          Function,
-          R""(enum class Enum {A}; ^switch (Enum::A) {})"",
-          R""(enum class Enum {A}; switch (Enum::A) {case Enum::A:break;})"",
-      },
-      {
-          // Scoped enumeration with multiple enumerators
-          Function,
-          R""(
-            enum class Enum {A,B};
-            ^switch (Enum::A) {}
-          )"",
-          R""(
-            enum class Enum {A,B};
-            switch (Enum::A) {case Enum::A:case Enum::B:break;}
-          )"",
-      },
-      {
-          // Only filling in missing enumerators (unscoped)
-          Function,
-          R""(
-            enum Enum {A,B,C};
-            ^switch (A) {case B:break;}
-          )"",
-          R""(
-            enum Enum {A,B,C};
-            switch (A) {case B:break;case A:case C:break;}
-          )"",
-      },
-      {
-          // Only filling in missing enumerators,
-          // even when using integer literals
-          Function,
-          R""(
-            enum Enum {A,B=1,C};
-            ^switch (A) {case 1:break;}
-          )"",
-          R""(
-            enum Enum {A,B=1,C};
-            switch (A) {case 1:break;case A:case C:break;}
-          )"",
-      },
-      {
-          // Only filling in missing enumerators (scoped)
-          Function,
-          R""(
-            enum class Enum {A,B,C};
-            ^switch (Enum::A)
-            {case Enum::B:break;}
-          )"",
-          R""(
-            enum class Enum {A,B,C};
-            switch (Enum::A)
-            {case Enum::B:break;case Enum::A:case Enum::C:break;}
-          )"",
-      },
-      {
-          // Scoped enumerations in namespace
-          File,
-          R""(
-            namespace ns { enum class Enum {A}; }
-            void function() { ^switch (ns::Enum::A) {} }
-          )"",
-          R""(
-            namespace ns { enum class Enum {A}; }
-            void function() { switch (ns::Enum::A) {case ns::Enum::A:break;} }
-          )"",
-      },
-      {
-          // Unscoped enumerations in namespace
-          File,
-          R""(
-            namespace ns { enum Enum {A}; }
-            void function() { ^switch (ns::A) {} }
-          )"",
-          R""(
-            namespace ns { enum Enum {A}; }
-            void function() { switch (ns::A) {case ns::A:break;} }
-          )"",
-      },
-      {
-          // Duplicated constant names
-          Function,
-          R""(enum Enum {A,B,b=B}; ^switch (A) {})"",
-          R""(enum Enum {A,B,b=B}; switch (A) {case A:case B:break;})"",
-      },
-      {
-          // Duplicated constant names all in switch
-          Function,
-          R""(enum Enum {A,B,b=B}; ^switch (A) {case A:case B:break;})"",
-          "unavailable",
-      },
-      {
-          // Enum is dependent type
-          File,
-          R""(template<typename T> void f() {enum Enum {A}; ^switch (A) {}})"",
-          "unavailable",
-      },
-  };
-
-  for (const auto &Case : Cases) {
-    Context = Case.Context;
-    EXPECT_EQ(apply(Case.TestSource), Case.ExpectedSource);
-  }
-}
-
-} // namespace
-} // namespace clangd
-} // namespace clang

clang-tools-extra/clangd/unittests/tweaks/AddUsingTests.cpp

+//===-- AddUsingTests.cpp ---------------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "Annotations.h"
+#include "Config.h"
+#include "SourceCode.h"
+#include "TestFS.h"
+#include "TestTU.h"
+#include "TweakTesting.h"
+#include "refactor/Tweak.h"
+#include "clang/AST/Expr.h"
+#include "clang/Basic/Diagnostic.h"
+#include "clang/Basic/DiagnosticIDs.h"
+#include "clang/Basic/DiagnosticOptions.h"
+#include "clang/Basic/FileManager.h"
+#include "clang/Basic/FileSystemOptions.h"
+#include "clang/Basic/LLVM.h"
+#include "clang/Basic/SourceLocation.h"
+#include "clang/Basic/SourceManager.h"
+#include "clang/Rewrite/Core/Rewriter.h"
+#include "clang/Tooling/Core/Replacement.h"
+#include "llvm/ADT/IntrusiveRefCntPtr.h"
+#include "llvm/ADT/StringExtras.h"
+#include "llvm/ADT/StringMap.h"
+#include "llvm/ADT/StringRef.h"
+#include "llvm/Support/Error.h"
+#include "llvm/Support/MemoryBuffer.h"
+#include "llvm/Support/VirtualFileSystem.h"
+#include "llvm/Testing/Support/Error.h"
+#include "gmock/gmock-matchers.h"
+#include "gmock/gmock.h"
+#include "gtest/gtest.h"
+#include <cassert>
+#include <string>
+#include <utility>
+#include <vector>
+
+namespace clang {
+namespace clangd {
+namespace {
+
+TWEAK_TEST(AddUsing);
+
+TEST_F(AddUsingTest, Prepare) {
+  Config Cfg;
+  Cfg.Style.FullyQualifiedNamespaces.push_back("ban");
+  WithContextValue WithConfig(Config::Key, std::move(Cfg));
+
+  const std::string Header = R"cpp(
+#define NS(name) one::two::name
+namespace ban { void foo() {} }
+namespace banana { void foo() {} }
+namespace one {
+void oo() {}
+template<typename TT> class tt {};
+namespace two {
+enum ee {};
+void ff() {}
+class cc {
+public:
+  struct st {};
+  static void mm() {}
+  cc operator|(const cc& x) const { return x; }
+};
+}
+})cpp";
+
+  EXPECT_AVAILABLE(Header + "void fun() { o^n^e^:^:^t^w^o^:^:^f^f(); }");
+  EXPECT_AVAILABLE(Header + "void fun() { o^n^e^::^o^o(); }");
+  EXPECT_AVAILABLE(Header + "void fun() { o^n^e^:^:^t^w^o^:^:^e^e E; }");
+  EXPECT_AVAILABLE(Header + "void fun() { o^n^e^:^:^t^w^o:^:^c^c C; }");
+  EXPECT_UNAVAILABLE(Header +
+                     "void fun() { o^n^e^:^:^t^w^o^:^:^c^c^:^:^m^m(); }");
+  EXPECT_UNAVAILABLE(Header +
+                     "void fun() { o^n^e^:^:^t^w^o^:^:^c^c^:^:^s^t inst; }");
+  EXPECT_UNAVAILABLE(Header +
+                     "void fun() { o^n^e^:^:^t^w^o^:^:^c^c^:^:^s^t inst; }");
+  EXPECT_UNAVAILABLE(Header + "void fun() { N^S(c^c) inst; }");
+  // This used to crash. Ideally we would support this case, but for now we just
+  // test that we don't crash.
+  EXPECT_UNAVAILABLE(Header +
+                     "template<typename TT> using foo = one::tt<T^T>;");
+  // Test that we don't crash or misbehave on unnamed DeclRefExpr.
+  EXPECT_UNAVAILABLE(Header +
+                     "void fun() { one::two::cc() ^| one::two::cc(); }");
+  // Do not offer code action when operating on a banned namespace.
+  EXPECT_UNAVAILABLE(Header + "void fun() { ban::fo^o(); }");
+  EXPECT_UNAVAILABLE(Header + "void fun() { ::ban::fo^o(); }");
+  EXPECT_AVAILABLE(Header + "void fun() { banana::fo^o(); }");
+
+  // Do not offer code action on typo-corrections.
+  EXPECT_UNAVAILABLE(Header + "/*error-ok*/c^c C;");
+
+  // NestedNameSpecifier, but no namespace.
+  EXPECT_UNAVAILABLE(Header + "class Foo {}; class F^oo foo;");
+
+  // Check that we do not trigger in header files.
+  FileName = "test.h";
+  ExtraArgs.push_back("-xc++-header"); // .h file is treated a C by default.
+  EXPECT_UNAVAILABLE(Header + "void fun() { one::two::f^f(); }");
+  FileName = "test.hpp";
+  EXPECT_UNAVAILABLE(Header + "void fun() { one::two::f^f(); }");
+}
+
+TEST_F(AddUsingTest, Apply) {
+  FileName = "test.cpp";
+  struct {
+    llvm::StringRef TestSource;
+    llvm::StringRef ExpectedSource;
+  } Cases[]{{
+                // Function, no other using, namespace.
+                R"cpp(
+#include "test.hpp"
+namespace {
+void fun() {
+  ^o^n^e^:^:^t^w^o^:^:^f^f();
+}
+})cpp",
+                R"cpp(
+#include "test.hpp"
+namespace {using one::two::ff;
+
+void fun() {
+  ff();
+}
+})cpp",
+            },
+            // Type, no other using, namespace.
+            {
+                R"cpp(
+#include "test.hpp"
+namespace {
+void fun() {
+  ::on^e::t^wo::c^c inst;
+}
+})cpp",
+                R"cpp(
+#include "test.hpp"
+namespace {using ::one::two::cc;
+
+void fun() {
+  cc inst;
+}
+})cpp",
+            },
+            // Type, no other using, no namespace.
+            {
+                R"cpp(
+#include "test.hpp"
+
+void fun() {
+  on^e::t^wo::e^e inst;
+})cpp",
+                R"cpp(
+#include "test.hpp"
+
+using one::two::ee;
+
+void fun() {
+  ee inst;
+})cpp"},
+            // Function, other usings.
+            {
+                R"cpp(
+#include "test.hpp"
+
+using one::two::cc;
+using one::two::ee;
+
+namespace {
+void fun() {
+  one::two::f^f();
+}
+})cpp",
+                R"cpp(
+#include "test.hpp"
+
+using one::two::cc;
+using one::two::ff;using one::two::ee;
+
+namespace {
+void fun() {
+  ff();
+}
+})cpp",
+            },
+            // Function, other usings inside namespace.
+            {
+                R"cpp(
+#include "test.hpp"
+
+using one::two::cc;
+
+namespace {
+
+using one::two::ff;
+
+void fun() {
+  o^ne::o^o();
+}
+})cpp",
+                R"cpp(
+#include "test.hpp"
+
+using one::two::cc;
+
+namespace {
+
+using one::oo;using one::two::ff;
+
+void fun() {
+  oo();
+}
+})cpp"},
+            // Using comes after cursor.
+            {
+                R"cpp(
+#include "test.hpp"
+
+namespace {
+
+void fun() {
+  one::t^wo::ff();
+}
+
+using one::two::cc;
+
+})cpp",
+                R"cpp(
+#include "test.hpp"
+
+namespace {using one::two::ff;
+
+
+void fun() {
+  ff();
+}
+
+using one::two::cc;
+
+})cpp"},
+            // Pointer type.
+            {R"cpp(
+#include "test.hpp"
+
+void fun() {
+  one::two::c^c *p;
+})cpp",
+             R"cpp(
+#include "test.hpp"
+
+using one::two::cc;
+
+void fun() {
+  cc *p;
+})cpp"},
+            // Namespace declared via macro.
+            {R"cpp(
+#include "test.hpp"
+#define NS_BEGIN(name) namespace name {
+
+NS_BEGIN(foo)
+
+void fun() {
+  one::two::f^f();
+}
+})cpp",
+             R"cpp(
+#include "test.hpp"
+#define NS_BEGIN(name) namespace name {
+
+using one::two::ff;
+
+NS_BEGIN(foo)
+
+void fun() {
+  ff();
+}
+})cpp"},
+            // Inside macro argument.
+            {R"cpp(
+#include "test.hpp"
+#define CALL(name) name()
+
+void fun() {
+  CALL(one::t^wo::ff);
+})cpp",
+             R"cpp(
+#include "test.hpp"
+#define CALL(name) name()
+
+using one::two::ff;
+
+void fun() {
+  CALL(ff);
+})cpp"},
+            // Parent namespace != lexical parent namespace
+            {R"cpp(
+#include "test.hpp"
+namespace foo { void fun(); }
+
+void foo::fun() {
+  one::two::f^f();
+})cpp",
+             R"cpp(
+#include "test.hpp"
+using one::two::ff;
+
+namespace foo { void fun(); }
+
+void foo::fun() {
+  ff();
+})cpp"},
+            // If all other using are fully qualified, add ::
+            {R"cpp(
+#include "test.hpp"
+
+using ::one::two::cc;
+using ::one::two::ee;
+
+void fun() {
+  one::two::f^f();
+})cpp",
+             R"cpp(
+#include "test.hpp"
+
+using ::one::two::cc;
+using ::one::two::ff;using ::one::two::ee;
+
+void fun() {
+  ff();
+})cpp"},
+            // Make sure we don't add :: if it's already there
+            {R"cpp(
+#include "test.hpp"
+
+using ::one::two::cc;
+using ::one::two::ee;
+
+void fun() {
+  ::one::two::f^f();
+})cpp",
+             R"cpp(
+#include "test.hpp"
+
+using ::one::two::cc;
+using ::one::two::ff;using ::one::two::ee;
+
+void fun() {
+  ff();
+})cpp"},
+            // If even one using doesn't start with ::, do not add it
+            {R"cpp(
+#include "test.hpp"
+
+using ::one::two::cc;
+using one::two::ee;
+
+void fun() {
+  one::two::f^f();
+})cpp",
+             R"cpp(
+#include "test.hpp"
+
+using ::one::two::cc;
+using one::two::ff;using one::two::ee;
+
+void fun() {
+  ff();
+})cpp"},
+            // using alias; insert using for the spelled name.
+            {R"cpp(
+#include "test.hpp"
+
+void fun() {
+  one::u^u u;
+})cpp",
+             R"cpp(
+#include "test.hpp"
+
+using one::uu;
+
+void fun() {
+  uu u;
+})cpp"},
+            // using namespace.
+            {R"cpp(
+#include "test.hpp"
+using namespace one;
+namespace {
+two::c^c C;
+})cpp",
+             R"cpp(
+#include "test.hpp"
+using namespace one;
+namespace {using two::cc;
+
+cc C;
+})cpp"},
+            // Type defined in main file, make sure using is after that.
+            {R"cpp(
+namespace xx {
+  struct yy {};
+}
+
+x^x::yy X;
+)cpp",
+             R"cpp(
+namespace xx {
+  struct yy {};
+}
+
+using xx::yy;
+
+yy X;
+)cpp"},
+            // Type defined in main file via "using", insert after that.
+            {R"cpp(
+#include "test.hpp"
+
+namespace xx {
+  using yy = one::two::cc;
+}
+
+x^x::yy X;
+)cpp",
+             R"cpp(
+#include "test.hpp"
+
+namespace xx {
+  using yy = one::two::cc;
+}
+
+using xx::yy;
+
+yy X;
+)cpp"},
+            // Using must come after function definition.
+            {R"cpp(
+namespace xx {
+  void yy();
+}
+
+void fun() {
+  x^x::yy();
+}
+)cpp",
+             R"cpp(
+namespace xx {
+  void yy();
+}
+
+using xx::yy;
+
+void fun() {
+  yy();
+}
+)cpp"},
+            // Existing using with non-namespace part.
+            {R"cpp(
+#include "test.hpp"
+using one::two::ee::ee_one;
+one::t^wo::cc c;
+)cpp",
+             R"cpp(
+#include "test.hpp"
+using one::two::cc;using one::two::ee::ee_one;
+cc c;
+)cpp"}};
+  llvm::StringMap<std::string> EditedFiles;
+  for (const auto &Case : Cases) {
+    for (const auto &SubCase : expandCases(Case.TestSource)) {
+      ExtraFiles["test.hpp"] = R"cpp(
+namespace one {
+void oo() {}
+namespace two {
+enum ee {ee_one};
+void ff() {}
+class cc {
+public:
+  struct st { struct nested {}; };
+  static void mm() {}
+};
+}
+using uu = two::cc;
+})cpp";
+      EXPECT_EQ(apply(SubCase, &EditedFiles), Case.ExpectedSource);
+    }
+  }
+}
+
+} // namespace
+} // namespace clangd
+} // namespace clang

clang-tools-extra/clangd/unittests/tweaks/AnnotateHighlightingsTests.cpp

+//===-- AnnotateHighlightingsTests.cpp --------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "Annotations.h"
+#include "Config.h"
+#include "SourceCode.h"
+#include "TestFS.h"
+#include "TestTU.h"
+#include "TweakTesting.h"
+#include "refactor/Tweak.h"
+#include "clang/AST/Expr.h"
+#include "clang/Basic/Diagnostic.h"
+#include "clang/Basic/DiagnosticIDs.h"
+#include "clang/Basic/DiagnosticOptions.h"
+#include "clang/Basic/FileManager.h"
+#include "clang/Basic/FileSystemOptions.h"
+#include "clang/Basic/LLVM.h"
+#include "clang/Basic/SourceLocation.h"
+#include "clang/Basic/SourceManager.h"
+#include "clang/Rewrite/Core/Rewriter.h"
+#include "clang/Tooling/Core/Replacement.h"
+#include "llvm/ADT/IntrusiveRefCntPtr.h"
+#include "llvm/ADT/StringExtras.h"
+#include "llvm/ADT/StringMap.h"
+#include "llvm/ADT/StringRef.h"
+#include "llvm/Support/Error.h"
+#include "llvm/Support/MemoryBuffer.h"
+#include "llvm/Support/VirtualFileSystem.h"
+#include "llvm/Testing/Support/Error.h"
+#include "gmock/gmock-matchers.h"
+#include "gmock/gmock.h"
+#include "gtest/gtest.h"
+#include <cassert>
+#include <string>
+#include <utility>
+#include <vector>
+
+namespace clang {
+namespace clangd {
+namespace {
+
+TWEAK_TEST(AnnotateHighlightings);
+
+TEST_F(AnnotateHighlightingsTest, Test) {
+  EXPECT_AVAILABLE("^vo^id^ ^f(^) {^}^"); // available everywhere.
+  EXPECT_AVAILABLE("[[int a; int b;]]");
+  EXPECT_EQ("void /* entity.name.function.cpp */f() {}", apply("void ^f() {}"));
+
+  EXPECT_EQ(apply("[[void f1(); void f2();]]"),
+            "void /* entity.name.function.cpp */f1(); "
+            "void /* entity.name.function.cpp */f2();");
+
+  EXPECT_EQ(apply("void f1(); void f2() {^}"),
+            "void f1(); "
+            "void /* entity.name.function.cpp */f2() {}");
+}
+
+} // namespace
+} // namespace clangd
+} // namespace clang

clang-tools-extra/clangd/unittests/tweaks/DefineInlineTests.cpp

+//===-- DefineInlineTests.cpp -----------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "Annotations.h"
+#include "Config.h"
+#include "SourceCode.h"
+#include "TestFS.h"
+#include "TestTU.h"
+#include "TweakTesting.h"
+#include "refactor/Tweak.h"
+#include "clang/AST/Expr.h"
+#include "clang/Basic/Diagnostic.h"
+#include "clang/Basic/DiagnosticIDs.h"
+#include "clang/Basic/DiagnosticOptions.h"
+#include "clang/Basic/FileManager.h"
+#include "clang/Basic/FileSystemOptions.h"
+#include "clang/Basic/LLVM.h"
+#include "clang/Basic/SourceLocation.h"
+#include "clang/Basic/SourceManager.h"
+#include "clang/Rewrite/Core/Rewriter.h"
+#include "clang/Tooling/Core/Replacement.h"
+#include "llvm/ADT/IntrusiveRefCntPtr.h"
+#include "llvm/ADT/StringExtras.h"
+#include "llvm/ADT/StringMap.h"
+#include "llvm/ADT/StringRef.h"
+#include "llvm/Support/Error.h"
+#include "llvm/Support/MemoryBuffer.h"
+#include "llvm/Support/VirtualFileSystem.h"
+#include "llvm/Testing/Support/Error.h"
+#include "gmock/gmock-matchers.h"
+#include "gmock/gmock.h"
+#include "gtest/gtest.h"
+#include <cassert>
+#include <string>
+#include <utility>
+#include <vector>
+
+using ::testing::ElementsAre;
+
+namespace clang {
+namespace clangd {
+namespace {
+
+TWEAK_TEST(DefineInline);
+
+TEST_F(DefineInlineTest, TriggersOnFunctionDecl) {
+  // Basic check for function body and signature.
+  EXPECT_AVAILABLE(R"cpp(
+  class Bar {
+    void baz();
+  };
+
+  [[void [[Bar::[[b^a^z]]]]() [[{
+    return;
+  }]]]]
+
+  void foo();
+  [[void [[f^o^o]]() [[{
+    return;
+  }]]]]
+  )cpp");
+
+  EXPECT_UNAVAILABLE(R"cpp(
+  // Not a definition
+  vo^i[[d^ ^f]]^oo();
+
+  [[vo^id ]]foo[[()]] {[[
+    [[(void)(5+3);
+    return;]]
+  }]]
+
+  // Definition with no body.
+  class Bar { Bar() = def^ault; };
+  )cpp");
+}
+
+TEST_F(DefineInlineTest, NoForwardDecl) {
+  Header = "void bar();";
+  EXPECT_UNAVAILABLE(R"cpp(
+  void bar() {
+    return;
+  }
+  // FIXME: Generate a decl in the header.
+  void fo^o() {
+    return;
+  })cpp");
+}
+
+TEST_F(DefineInlineTest, ReferencedDecls) {
+  EXPECT_AVAILABLE(R"cpp(
+    void bar();
+    void foo(int test);
+
+    void fo^o(int baz) {
+      int x = 10;
+      bar();
+    })cpp");
+
+  // Internal symbol usage.
+  Header = "void foo(int test);";
+  EXPECT_UNAVAILABLE(R"cpp(
+    void bar();
+    void fo^o(int baz) {
+      int x = 10;
+      bar();
+    })cpp");
+
+  // Becomes available after making symbol visible.
+  Header = "void bar();" + Header;
+  EXPECT_AVAILABLE(R"cpp(
+    void fo^o(int baz) {
+      int x = 10;
+      bar();
+    })cpp");
+
+  // FIXME: Move declaration below bar to make it visible.
+  Header.clear();
+  EXPECT_UNAVAILABLE(R"cpp(
+    void foo();
+    void bar();
+
+    void fo^o() {
+      bar();
+    })cpp");
+
+  // Order doesn't matter within a class.
+  EXPECT_AVAILABLE(R"cpp(
+    class Bar {
+      void foo();
+      void bar();
+    };
+
+    void Bar::fo^o() {
+      bar();
+    })cpp");
+
+  // FIXME: Perform include insertion to make symbol visible.
+  ExtraFiles["a.h"] = "void bar();";
+  Header = "void foo(int test);";
+  EXPECT_UNAVAILABLE(R"cpp(
+    #include "a.h"
+    void fo^o(int baz) {
+      int x = 10;
+      bar();
+    })cpp");
+}
+
+TEST_F(DefineInlineTest, TemplateSpec) {
+  EXPECT_UNAVAILABLE(R"cpp(
+    template <typename T> void foo();
+    template<> void foo<char>();
+
+    template<> void f^oo<int>() {
+    })cpp");
+  EXPECT_UNAVAILABLE(R"cpp(
+    template <typename T> void foo();
+
+    template<> void f^oo<int>() {
+    })cpp");
+  EXPECT_UNAVAILABLE(R"cpp(
+    template <typename T> struct Foo { void foo(); };
+
+    template <typename T> void Foo<T>::f^oo() {
+    })cpp");
+  EXPECT_AVAILABLE(R"cpp(
+    template <typename T> void foo();
+    void bar();
+    template <> void foo<int>();
+
+    template<> void f^oo<int>() {
+      bar();
+    })cpp");
+  EXPECT_UNAVAILABLE(R"cpp(
+    namespace bar {
+      template <typename T> void f^oo() {}
+      template void foo<int>();
+    })cpp");
+}
+
+TEST_F(DefineInlineTest, CheckForCanonDecl) {
+  EXPECT_UNAVAILABLE(R"cpp(
+    void foo();
+
+    void bar() {}
+    void f^oo() {
+      // This bar normally refers to the definition just above, but it is not
+      // visible from the forward declaration of foo.
+      bar();
+    })cpp");
+  // Make it available with a forward decl.
+  EXPECT_AVAILABLE(R"cpp(
+    void bar();
+    void foo();
+
+    void bar() {}
+    void f^oo() {
+      bar();
+    })cpp");
+}
+
+TEST_F(DefineInlineTest, UsingShadowDecls) {
+  // Template body is not parsed until instantiation time on windows, which
+  // results in arbitrary failures as function body becomes NULL.
+  ExtraArgs.push_back("-fno-delayed-template-parsing");
+  EXPECT_UNAVAILABLE(R"cpp(
+  namespace ns1 { void foo(int); }
+  namespace ns2 { void foo(int*); }
+  template <typename T>
+  void bar();
+
+  using ns1::foo;
+  using ns2::foo;
+
+  template <typename T>
+  void b^ar() {
+    foo(T());
+  })cpp");
+}
+
+TEST_F(DefineInlineTest, TransformNestedNamespaces) {
+  auto Test = R"cpp(
+    namespace a {
+      void bar();
+      namespace b {
+        void baz();
+        namespace c {
+          void aux();
+        }
+      }
+    }
+
+    void foo();
+    using namespace a;
+    using namespace b;
+    using namespace c;
+    void f^oo() {
+      bar();
+      a::bar();
+
+      baz();
+      b::baz();
+      a::b::baz();
+
+      aux();
+      c::aux();
+      b::c::aux();
+      a::b::c::aux();
+    })cpp";
+  auto Expected = R"cpp(
+    namespace a {
+      void bar();
+      namespace b {
+        void baz();
+        namespace c {
+          void aux();
+        }
+      }
+    }
+
+    void foo(){
+      a::bar();
+      a::bar();
+
+      a::b::baz();
+      a::b::baz();
+      a::b::baz();
+
+      a::b::c::aux();
+      a::b::c::aux();
+      a::b::c::aux();
+      a::b::c::aux();
+    }
+    using namespace a;
+    using namespace b;
+    using namespace c;
+    )cpp";
+  EXPECT_EQ(apply(Test), Expected);
+}
+
+TEST_F(DefineInlineTest, TransformUsings) {
+  auto Test = R"cpp(
+    namespace a { namespace b { namespace c { void aux(); } } }
+
+    void foo();
+    void f^oo() {
+      using namespace a;
+      using namespace b;
+      using namespace c;
+      using c::aux;
+      namespace d = c;
+    })cpp";
+  auto Expected = R"cpp(
+    namespace a { namespace b { namespace c { void aux(); } } }
+
+    void foo(){
+      using namespace a;
+      using namespace a::b;
+      using namespace a::b::c;
+      using a::b::c::aux;
+      namespace d = a::b::c;
+    }
+    )cpp";
+  EXPECT_EQ(apply(Test), Expected);
+}
+
+TEST_F(DefineInlineTest, TransformDecls) {
+  auto Test = R"cpp(
+    void foo();
+    void f^oo() {
+      class Foo {
+      public:
+        void foo();
+        int x;
+      };
+
+      enum En { Zero, One };
+      En x = Zero;
+
+      enum class EnClass { Zero, One };
+      EnClass y = EnClass::Zero;
+    })cpp";
+  auto Expected = R"cpp(
+    void foo(){
+      class Foo {
+      public:
+        void foo();
+        int x;
+      };
+
+      enum En { Zero, One };
+      En x = Zero;
+
+      enum class EnClass { Zero, One };
+      EnClass y = EnClass::Zero;
+    }
+    )cpp";
+  EXPECT_EQ(apply(Test), Expected);
+}
+
+TEST_F(DefineInlineTest, TransformTemplDecls) {
+  auto Test = R"cpp(
+    namespace a {
+      template <typename T> class Bar {
+      public:
+        void bar();
+      };
+      template <typename T> T bar;
+      template <typename T> void aux() {}
+    }
+
+    void foo();
+
+    using namespace a;
+    void f^oo() {
+      bar<Bar<int>>.bar();
+      aux<Bar<int>>();
+    })cpp";
+  auto Expected = R"cpp(
+    namespace a {
+      template <typename T> class Bar {
+      public:
+        void bar();
+      };
+      template <typename T> T bar;
+      template <typename T> void aux() {}
+    }
+
+    void foo(){
+      a::bar<a::Bar<int>>.bar();
+      a::aux<a::Bar<int>>();
+    }
+
+    using namespace a;
+    )cpp";
+  EXPECT_EQ(apply(Test), Expected);
+}
+
+TEST_F(DefineInlineTest, TransformMembers) {
+  auto Test = R"cpp(
+    class Foo {
+      void foo();
+    };
+
+    void Foo::f^oo() {
+      return;
+    })cpp";
+  auto Expected = R"cpp(
+    class Foo {
+      void foo(){
+      return;
+    }
+    };
+
+    )cpp";
+  EXPECT_EQ(apply(Test), Expected);
+
+  ExtraFiles["a.h"] = R"cpp(
+    class Foo {
+      void foo();
+    };)cpp";
+
+  llvm::StringMap<std::string> EditedFiles;
+  Test = R"cpp(
+    #include "a.h"
+    void Foo::f^oo() {
+      return;
+    })cpp";
+  Expected = R"cpp(
+    #include "a.h"
+    )cpp";
+  EXPECT_EQ(apply(Test, &EditedFiles), Expected);
+
+  Expected = R"cpp(
+    class Foo {
+      void foo(){
+      return;
+    }
+    };)cpp";
+  EXPECT_THAT(EditedFiles,
+              ElementsAre(FileWithContents(testPath("a.h"), Expected)));
+}
+
+TEST_F(DefineInlineTest, TransformDependentTypes) {
+  auto Test = R"cpp(
+    namespace a {
+      template <typename T> class Bar {};
+    }
+
+    template <typename T>
+    void foo();
+
+    using namespace a;
+    template <typename T>
+    void f^oo() {
+      Bar<T> B;
+      Bar<Bar<T>> q;
+    })cpp";
+  auto Expected = R"cpp(
+    namespace a {
+      template <typename T> class Bar {};
+    }
+
+    template <typename T>
+    void foo(){
+      a::Bar<T> B;
+      a::Bar<a::Bar<T>> q;
+    }
+
+    using namespace a;
+    )cpp";
+
+  // Template body is not parsed until instantiation time on windows, which
+  // results in arbitrary failures as function body becomes NULL.
+  ExtraArgs.push_back("-fno-delayed-template-parsing");
+  EXPECT_EQ(apply(Test), Expected);
+}
+
+TEST_F(DefineInlineTest, TransformFunctionTempls) {
+  // Check we select correct specialization decl.
+  std::pair<llvm::StringRef, llvm::StringRef> Cases[] = {
+      {R"cpp(
+          template <typename T>
+          void foo(T p);
+
+          template <>
+          void foo<int>(int p);
+
+          template <>
+          void foo<char>(char p);
+
+          template <>
+          void fo^o<int>(int p) {
+            return;
+          })cpp",
+       R"cpp(
+          template <typename T>
+          void foo(T p);
+
+          template <>
+          void foo<int>(int p){
+            return;
+          }
+
+          template <>
+          void foo<char>(char p);
+
+          )cpp"},
+      {// Make sure we are not selecting the first specialization all the time.
+       R"cpp(
+          template <typename T>
+          void foo(T p);
+
+          template <>
+          void foo<int>(int p);
+
+          template <>
+          void foo<char>(char p);
+
+          template <>
+          void fo^o<char>(char p) {
+            return;
+          })cpp",
+       R"cpp(
+          template <typename T>
+          void foo(T p);
+
+          template <>
+          void foo<int>(int p);
+
+          template <>
+          void foo<char>(char p){
+            return;
+          }
+
+          )cpp"},
+      {R"cpp(
+          template <typename T>
+          void foo(T p);
+
+          template <>
+          void foo<int>(int p);
+
+          template <typename T>
+          void fo^o(T p) {
+            return;
+          })cpp",
+       R"cpp(
+          template <typename T>
+          void foo(T p){
+            return;
+          }
+
+          template <>
+          void foo<int>(int p);
+
+          )cpp"},
+  };
+  // Template body is not parsed until instantiation time on windows, which
+  // results in arbitrary failures as function body becomes NULL.
+  ExtraArgs.push_back("-fno-delayed-template-parsing");
+  for (const auto &Case : Cases)
+    EXPECT_EQ(apply(Case.first), Case.second) << Case.first;
+}
+
+TEST_F(DefineInlineTest, TransformTypeLocs) {
+  auto Test = R"cpp(
+    namespace a {
+      template <typename T> class Bar {
+      public:
+        template <typename Q> class Baz {};
+      };
+      class Foo{};
+    }
+
+    void foo();
+
+    using namespace a;
+    void f^oo() {
+      Bar<int> B;
+      Foo foo;
+      a::Bar<Bar<int>>::Baz<Bar<int>> q;
+    })cpp";
+  auto Expected = R"cpp(
+    namespace a {
+      template <typename T> class Bar {
+      public:
+        template <typename Q> class Baz {};
+      };
+      class Foo{};
+    }
+
+    void foo(){
+      a::Bar<int> B;
+      a::Foo foo;
+      a::Bar<a::Bar<int>>::Baz<a::Bar<int>> q;
+    }
+
+    using namespace a;
+    )cpp";
+  EXPECT_EQ(apply(Test), Expected);
+}
+
+TEST_F(DefineInlineTest, TransformDeclRefs) {
+  auto Test = R"cpp(
+    namespace a {
+      template <typename T> class Bar {
+      public:
+        void foo();
+        static void bar();
+        int x;
+        static int y;
+      };
+      void bar();
+      void test();
+    }
+
+    void foo();
+    using namespace a;
+    void f^oo() {
+      a::Bar<int> B;
+      B.foo();
+      a::bar();
+      Bar<Bar<int>>::bar();
+      a::Bar<int>::bar();
+      B.x = Bar<int>::y;
+      Bar<int>::y = 3;
+      bar();
+      a::test();
+    })cpp";
+  auto Expected = R"cpp(
+    namespace a {
+      template <typename T> class Bar {
+      public:
+        void foo();
+        static void bar();
+        int x;
+        static int y;
+      };
+      void bar();
+      void test();
+    }
+
+    void foo(){
+      a::Bar<int> B;
+      B.foo();
+      a::bar();
+      a::Bar<a::Bar<int>>::bar();
+      a::Bar<int>::bar();
+      B.x = a::Bar<int>::y;
+      a::Bar<int>::y = 3;
+      a::bar();
+      a::test();
+    }
+    using namespace a;
+    )cpp";
+  EXPECT_EQ(apply(Test), Expected);
+}
+
+TEST_F(DefineInlineTest, StaticMembers) {
+  auto Test = R"cpp(
+    namespace ns { class X { static void foo(); void bar(); }; }
+    void ns::X::b^ar() {
+      foo();
+    })cpp";
+  auto Expected = R"cpp(
+    namespace ns { class X { static void foo(); void bar(){
+      foo();
+    } }; }
+    )cpp";
+  EXPECT_EQ(apply(Test), Expected);
+}
+
+TEST_F(DefineInlineTest, TransformParamNames) {
+  std::pair<llvm::StringRef, llvm::StringRef> Cases[] = {
+      {R"cpp(
+        void foo(int, bool b, int T\
+est);
+        void ^foo(int f, bool x, int z) {})cpp",
+       R"cpp(
+        void foo(int f, bool x, int z){}
+        )cpp"},
+      {R"cpp(
+        #define PARAM int Z
+        void foo(PARAM);
+
+        void ^foo(int X) {})cpp",
+       "fail: Cant rename parameter inside macro body."},
+      {R"cpp(
+        #define TYPE int
+        #define PARAM TYPE Z
+        #define BODY(x) 5 * (x) + 2
+        template <int P>
+        void foo(PARAM, TYPE Q, TYPE, TYPE W = BODY(P));
+        template <int x>
+        void ^foo(int Z, int b, int c, int d) {})cpp",
+       R"cpp(
+        #define TYPE int
+        #define PARAM TYPE Z
+        #define BODY(x) 5 * (x) + 2
+        template <int x>
+        void foo(PARAM, TYPE b, TYPE c, TYPE d = BODY(x)){}
+        )cpp"},
+  };
+  ExtraArgs.push_back("-fno-delayed-template-parsing");
+  for (const auto &Case : Cases)
+    EXPECT_EQ(apply(Case.first), Case.second) << Case.first;
+}
+
+TEST_F(DefineInlineTest, TransformTemplParamNames) {
+  auto Test = R"cpp(
+    struct Foo {
+      struct Bar {
+        template <class, class X,
+                  template<typename> class, template<typename> class Y,
+                  int, int Z>
+        void foo(X, Y<X>, int W = 5 * Z + 2);
+      };
+    };
+
+    template <class T, class U,
+              template<typename> class V, template<typename> class W,
+              int X, int Y>
+    void Foo::Bar::f^oo(U, W<U>, int Q) {})cpp";
+  auto Expected = R"cpp(
+    struct Foo {
+      struct Bar {
+        template <class T, class U,
+                  template<typename> class V, template<typename> class W,
+                  int X, int Y>
+        void foo(U, W<U>, int Q = 5 * Y + 2){}
+      };
+    };
+
+    )cpp";
+  ExtraArgs.push_back("-fno-delayed-template-parsing");
+  EXPECT_EQ(apply(Test), Expected);
+}
+
+TEST_F(DefineInlineTest, TransformInlineNamespaces) {
+  auto Test = R"cpp(
+    namespace a { inline namespace b { namespace { struct Foo{}; } } }
+    void foo();
+
+    using namespace a;
+    void ^foo() {Foo foo;})cpp";
+  auto Expected = R"cpp(
+    namespace a { inline namespace b { namespace { struct Foo{}; } } }
+    void foo(){a::Foo foo;}
+
+    using namespace a;
+    )cpp";
+  EXPECT_EQ(apply(Test), Expected);
+}
+
+TEST_F(DefineInlineTest, TokensBeforeSemicolon) {
+  std::pair<llvm::StringRef, llvm::StringRef> Cases[] = {
+      {R"cpp(
+          void foo()    /*Comment -_-*/ /*Com 2*/ ;
+          void fo^o() { return ; })cpp",
+       R"cpp(
+          void foo()    /*Comment -_-*/ /*Com 2*/ { return ; }
+          )cpp"},
+
+      {R"cpp(
+          void foo();
+          void fo^o() { return ; })cpp",
+       R"cpp(
+          void foo(){ return ; }
+          )cpp"},
+
+      {R"cpp(
+          #define SEMI ;
+          void foo() SEMI
+          void fo^o() { return ; })cpp",
+       "fail: Couldn't find semicolon for target declaration."},
+  };
+  for (const auto &Case : Cases)
+    EXPECT_EQ(apply(Case.first), Case.second) << Case.first;
+}
+
+TEST_F(DefineInlineTest, HandleMacros) {
+  EXPECT_UNAVAILABLE(R"cpp(
+    #define BODY { return; }
+    void foo();
+    void f^oo()BODY)cpp");
+
+  EXPECT_UNAVAILABLE(R"cpp(
+    #define BODY void foo(){ return; }
+    void foo();
+    [[BODY]])cpp");
+
+  std::pair<llvm::StringRef, llvm::StringRef> Cases[] = {
+      // We don't qualify declarations coming from macros.
+      {R"cpp(
+          #define BODY Foo
+          namespace a { class Foo{}; }
+          void foo();
+          using namespace a;
+          void f^oo(){BODY();})cpp",
+       R"cpp(
+          #define BODY Foo
+          namespace a { class Foo{}; }
+          void foo(){BODY();}
+          using namespace a;
+          )cpp"},
+
+      // Macro is not visible at declaration location, but we proceed.
+      {R"cpp(
+          void foo();
+          #define BODY return;
+          void f^oo(){BODY})cpp",
+       R"cpp(
+          void foo(){BODY}
+          #define BODY return;
+          )cpp"},
+
+      {R"cpp(
+          #define TARGET void foo()
+          TARGET;
+          void f^oo(){ return; })cpp",
+       R"cpp(
+          #define TARGET void foo()
+          TARGET{ return; }
+          )cpp"},
+
+      {R"cpp(
+          #define TARGET foo
+          void TARGET();
+          void f^oo(){ return; })cpp",
+       R"cpp(
+          #define TARGET foo
+          void TARGET(){ return; }
+          )cpp"},
+  };
+  for (const auto &Case : Cases)
+    EXPECT_EQ(apply(Case.first), Case.second) << Case.first;
+}
+
+TEST_F(DefineInlineTest, DropCommonNameSpecifiers) {
+  struct {
+    llvm::StringRef Test;
+    llvm::StringRef Expected;
+  } Cases[] = {
+      {R"cpp(
+        namespace a { namespace b { void aux(); } }
+        namespace ns1 {
+          void foo();
+          namespace qq { void test(); }
+          namespace ns2 {
+            void bar();
+            namespace ns3 { void baz(); }
+          }
+        }
+
+        using namespace a;
+        using namespace a::b;
+        using namespace ns1::qq;
+        void ns1::ns2::ns3::b^az() {
+          foo();
+          bar();
+          baz();
+          ns1::ns2::ns3::baz();
+          aux();
+          test();
+        })cpp",
+       R"cpp(
+        namespace a { namespace b { void aux(); } }
+        namespace ns1 {
+          void foo();
+          namespace qq { void test(); }
+          namespace ns2 {
+            void bar();
+            namespace ns3 { void baz(){
+          foo();
+          bar();
+          baz();
+          ns1::ns2::ns3::baz();
+          a::b::aux();
+          qq::test();
+        } }
+          }
+        }
+
+        using namespace a;
+        using namespace a::b;
+        using namespace ns1::qq;
+        )cpp"},
+      {R"cpp(
+        namespace ns1 {
+          namespace qq { struct Foo { struct Bar {}; }; using B = Foo::Bar; }
+          namespace ns2 { void baz(); }
+        }
+
+        using namespace ns1::qq;
+        void ns1::ns2::b^az() { Foo f; B b; })cpp",
+       R"cpp(
+        namespace ns1 {
+          namespace qq { struct Foo { struct Bar {}; }; using B = Foo::Bar; }
+          namespace ns2 { void baz(){ qq::Foo f; qq::B b; } }
+        }
+
+        using namespace ns1::qq;
+        )cpp"},
+      {R"cpp(
+        namespace ns1 {
+          namespace qq {
+            template<class T> struct Foo { template <class U> struct Bar {}; };
+            template<class T, class U>
+            using B = typename Foo<T>::template Bar<U>;
+          }
+          namespace ns2 { void baz(); }
+        }
+
+        using namespace ns1::qq;
+        void ns1::ns2::b^az() { B<int, bool> b; })cpp",
+       R"cpp(
+        namespace ns1 {
+          namespace qq {
+            template<class T> struct Foo { template <class U> struct Bar {}; };
+            template<class T, class U>
+            using B = typename Foo<T>::template Bar<U>;
+          }
+          namespace ns2 { void baz(){ qq::B<int, bool> b; } }
+        }
+
+        using namespace ns1::qq;
+        )cpp"},
+  };
+  for (const auto &Case : Cases)
+    EXPECT_EQ(apply(Case.Test), Case.Expected) << Case.Test;
+}
+
+TEST_F(DefineInlineTest, QualifyWithUsingDirectives) {
+  llvm::StringRef Test = R"cpp(
+    namespace a {
+      void bar();
+      namespace b { struct Foo{}; void aux(); }
+      namespace c { void cux(); }
+    }
+    using namespace a;
+    using X = b::Foo;
+    void foo();
+
+    using namespace b;
+    using namespace c;
+    void ^foo() {
+      cux();
+      bar();
+      X x;
+      aux();
+      using namespace c;
+      // FIXME: The last reference to cux() in body of foo should not be
+      // qualified, since there is a using directive inside the function body.
+      cux();
+    })cpp";
+  llvm::StringRef Expected = R"cpp(
+    namespace a {
+      void bar();
+      namespace b { struct Foo{}; void aux(); }
+      namespace c { void cux(); }
+    }
+    using namespace a;
+    using X = b::Foo;
+    void foo(){
+      c::cux();
+      bar();
+      X x;
+      b::aux();
+      using namespace c;
+      // FIXME: The last reference to cux() in body of foo should not be
+      // qualified, since there is a using directive inside the function body.
+      c::cux();
+    }
+
+    using namespace b;
+    using namespace c;
+    )cpp";
+  EXPECT_EQ(apply(Test), Expected) << Test;
+}
+
+TEST_F(DefineInlineTest, AddInline) {
+  ExtraArgs.push_back("-fno-delayed-template-parsing");
+  llvm::StringMap<std::string> EditedFiles;
+  ExtraFiles["a.h"] = "void foo();";
+  apply(R"cpp(#include "a.h"
+              void fo^o() {})cpp",
+        &EditedFiles);
+  EXPECT_THAT(EditedFiles, testing::ElementsAre(FileWithContents(
+                               testPath("a.h"), "inline void foo(){}")));
+
+  // Check we put inline before cv-qualifiers.
+  ExtraFiles["a.h"] = "const int foo();";
+  apply(R"cpp(#include "a.h"
+              const int fo^o() {})cpp",
+        &EditedFiles);
+  EXPECT_THAT(EditedFiles, testing::ElementsAre(FileWithContents(
+                               testPath("a.h"), "inline const int foo(){}")));
+
+  // No double inline.
+  ExtraFiles["a.h"] = "inline void foo();";
+  apply(R"cpp(#include "a.h"
+              inline void fo^o() {})cpp",
+        &EditedFiles);
+  EXPECT_THAT(EditedFiles, testing::ElementsAre(FileWithContents(
+                               testPath("a.h"), "inline void foo(){}")));
+
+  // Constexprs don't need "inline".
+  ExtraFiles["a.h"] = "constexpr void foo();";
+  apply(R"cpp(#include "a.h"
+              constexpr void fo^o() {})cpp",
+        &EditedFiles);
+  EXPECT_THAT(EditedFiles, testing::ElementsAre(FileWithContents(
+                               testPath("a.h"), "constexpr void foo(){}")));
+
+  // Class members don't need "inline".
+  ExtraFiles["a.h"] = "struct Foo { void foo(); };";
+  apply(R"cpp(#include "a.h"
+              void Foo::fo^o() {})cpp",
+        &EditedFiles);
+  EXPECT_THAT(EditedFiles,
+              testing::ElementsAre(FileWithContents(
+                  testPath("a.h"), "struct Foo { void foo(){} };")));
+
+  // Function template doesn't need to be "inline"d.
+  ExtraFiles["a.h"] = "template <typename T> void foo();";
+  apply(R"cpp(#include "a.h"
+              template <typename T>
+              void fo^o() {})cpp",
+        &EditedFiles);
+  EXPECT_THAT(EditedFiles,
+              testing::ElementsAre(FileWithContents(
+                  testPath("a.h"), "template <typename T> void foo(){}")));
+
+  // Specializations needs to be marked "inline".
+  ExtraFiles["a.h"] = R"cpp(
+                            template <typename T> void foo();
+                            template <> void foo<int>();)cpp";
+  apply(R"cpp(#include "a.h"
+              template <>
+              void fo^o<int>() {})cpp",
+        &EditedFiles);
+  EXPECT_THAT(EditedFiles,
+              testing::ElementsAre(FileWithContents(testPath("a.h"),
+                                                    R"cpp(
+                            template <typename T> void foo();
+                            template <> inline void foo<int>(){})cpp")));
+}
+
+} // namespace
+} // namespace clangd
+} // namespace clang

clang-tools-extra/clangd/unittests/tweaks/DefineOutlineTests.cpp

+//===-- DefineOutline.cpp ---------------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "Annotations.h"
+#include "Config.h"
+#include "SourceCode.h"
+#include "TestFS.h"
+#include "TestTU.h"
+#include "TweakTesting.h"
+#include "refactor/Tweak.h"
+#include "clang/AST/Expr.h"
+#include "clang/Basic/Diagnostic.h"
+#include "clang/Basic/DiagnosticIDs.h"
+#include "clang/Basic/DiagnosticOptions.h"
+#include "clang/Basic/FileManager.h"
+#include "clang/Basic/FileSystemOptions.h"
+#include "clang/Basic/LLVM.h"
+#include "clang/Basic/SourceLocation.h"
+#include "clang/Basic/SourceManager.h"
+#include "clang/Rewrite/Core/Rewriter.h"
+#include "clang/Tooling/Core/Replacement.h"
+#include "llvm/ADT/IntrusiveRefCntPtr.h"
+#include "llvm/ADT/StringExtras.h"
+#include "llvm/ADT/StringMap.h"
+#include "llvm/ADT/StringRef.h"
+#include "llvm/Support/Error.h"
+#include "llvm/Support/MemoryBuffer.h"
+#include "llvm/Support/VirtualFileSystem.h"
+#include "llvm/Testing/Support/Error.h"
+#include "gmock/gmock-matchers.h"
+#include "gmock/gmock.h"
+#include "gtest/gtest.h"
+#include <cassert>
+#include <string>
+#include <utility>
+#include <vector>
+
+using ::testing::ElementsAre;
+
+namespace clang {
+namespace clangd {
+namespace {
+
+TWEAK_TEST(DefineOutline);
+
+TEST_F(DefineOutlineTest, TriggersOnFunctionDecl) {
+  FileName = "Test.cpp";
+  // Not available unless in a header file.
+  EXPECT_UNAVAILABLE(R"cpp(
+    [[void [[f^o^o]]() [[{
+      return;
+    }]]]])cpp");
+
+  FileName = "Test.hpp";
+  // Not available unless function name or fully body is selected.
+  EXPECT_UNAVAILABLE(R"cpp(
+    // Not a definition
+    vo^i[[d^ ^f]]^oo();
+
+    [[vo^id ]]foo[[()]] {[[
+      [[(void)(5+3);
+      return;]]
+    }]])cpp");
+
+  // Available even if there are no implementation files.
+  EXPECT_AVAILABLE(R"cpp(
+    [[void [[f^o^o]]() [[{
+      return;
+    }]]]])cpp");
+
+  // Not available for out-of-line methods.
+  EXPECT_UNAVAILABLE(R"cpp(
+    class Bar {
+      void baz();
+    };
+
+    [[void [[Bar::[[b^a^z]]]]() [[{
+      return;
+    }]]]])cpp");
+
+  // Basic check for function body and signature.
+  EXPECT_AVAILABLE(R"cpp(
+    class Bar {
+      [[void [[f^o^o^]]() [[{ return; }]]]]
+    };
+
+    void foo();
+    [[void [[f^o^o]]() [[{
+      return;
+    }]]]])cpp");
+
+  // Not available on defaulted/deleted members.
+  EXPECT_UNAVAILABLE(R"cpp(
+    class Foo {
+      Fo^o() = default;
+      F^oo(const Foo&) = delete;
+    };)cpp");
+
+  // Not available within templated classes, as it is hard to spell class name
+  // out-of-line in such cases.
+  EXPECT_UNAVAILABLE(R"cpp(
+    template <typename> struct Foo { void fo^o(){} };
+    )cpp");
+
+  // Not available on function templates and specializations, as definition must
+  // be visible to all translation units.
+  EXPECT_UNAVAILABLE(R"cpp(
+    template <typename> void fo^o() {};
+    template <> void fo^o<int>() {};
+  )cpp");
+}
+
+TEST_F(DefineOutlineTest, FailsWithoutSource) {
+  FileName = "Test.hpp";
+  llvm::StringRef Test = "void fo^o() { return; }";
+  llvm::StringRef Expected =
+      "fail: Couldn't find a suitable implementation file.";
+  EXPECT_EQ(apply(Test), Expected);
+}
+
+TEST_F(DefineOutlineTest, ApplyTest) {
+  llvm::StringMap<std::string> EditedFiles;
+  ExtraFiles["Test.cpp"] = "";
+  FileName = "Test.hpp";
+  // Template body is not parsed until instantiation time on windows, which
+  // results in arbitrary failures as function body becomes NULL.
+  ExtraArgs.push_back("-fno-delayed-template-parsing");
+
+  struct {
+    llvm::StringRef Test;
+    llvm::StringRef ExpectedHeader;
+    llvm::StringRef ExpectedSource;
+  } Cases[] = {
+      // Simple check
+      {
+          "void fo^o() { return; }",
+          "void foo() ;",
+          "void foo() { return; }",
+      },
+      // Default args.
+      {
+          "void fo^o(int x, int y = 5, int = 2, int (*foo)(int) = nullptr) {}",
+          "void foo(int x, int y = 5, int = 2, int (*foo)(int) = nullptr) ;",
+          "void foo(int x, int y , int , int (*foo)(int) ) {}",
+      },
+      // Constructors
+      {
+          R"cpp(
+            class Foo {public: Foo(); Foo(int);};
+            class Bar {
+              Ba^r() {}
+              Bar(int x) : f1(x) {}
+              Foo f1;
+              Foo f2 = 2;
+            };)cpp",
+          R"cpp(
+            class Foo {public: Foo(); Foo(int);};
+            class Bar {
+              Bar() ;
+              Bar(int x) : f1(x) {}
+              Foo f1;
+              Foo f2 = 2;
+            };)cpp",
+          "Bar::Bar() {}\n",
+      },
+      // Ctor with initializer.
+      {
+          R"cpp(
+            class Foo {public: Foo(); Foo(int);};
+            class Bar {
+              Bar() {}
+              B^ar(int x) : f1(x), f2(3) {}
+              Foo f1;
+              Foo f2 = 2;
+            };)cpp",
+          R"cpp(
+            class Foo {public: Foo(); Foo(int);};
+            class Bar {
+              Bar() {}
+              Bar(int x) ;
+              Foo f1;
+              Foo f2 = 2;
+            };)cpp",
+          "Bar::Bar(int x) : f1(x), f2(3) {}\n",
+      },
+      // Ctor initializer with attribute.
+      {
+          R"cpp(
+              class Foo {
+                F^oo(int z) __attribute__((weak)) : bar(2){}
+                int bar;
+              };)cpp",
+          R"cpp(
+              class Foo {
+                Foo(int z) __attribute__((weak)) ;
+                int bar;
+              };)cpp",
+          "Foo::Foo(int z) __attribute__((weak)) : bar(2){}\n",
+      },
+      // Virt specifiers.
+      {
+          R"cpp(
+            struct A {
+              virtual void f^oo() {}
+            };)cpp",
+          R"cpp(
+            struct A {
+              virtual void foo() ;
+            };)cpp",
+          " void A::foo() {}\n",
+      },
+      {
+          R"cpp(
+            struct A {
+              virtual virtual void virtual f^oo() {}
+            };)cpp",
+          R"cpp(
+            struct A {
+              virtual virtual void virtual foo() ;
+            };)cpp",
+          "  void  A::foo() {}\n",
+      },
+      {
+          R"cpp(
+            struct A {
+              virtual void foo() = 0;
+            };
+            struct B : A {
+              void fo^o() override {}
+            };)cpp",
+          R"cpp(
+            struct A {
+              virtual void foo() = 0;
+            };
+            struct B : A {
+              void foo() override ;
+            };)cpp",
+          "void B::foo()  {}\n",
+      },
+      {
+          R"cpp(
+            struct A {
+              virtual void foo() = 0;
+            };
+            struct B : A {
+              void fo^o() final {}
+            };)cpp",
+          R"cpp(
+            struct A {
+              virtual void foo() = 0;
+            };
+            struct B : A {
+              void foo() final ;
+            };)cpp",
+          "void B::foo()  {}\n",
+      },
+      {
+          R"cpp(
+            struct A {
+              virtual void foo() = 0;
+            };
+            struct B : A {
+              void fo^o() final override {}
+            };)cpp",
+          R"cpp(
+            struct A {
+              virtual void foo() = 0;
+            };
+            struct B : A {
+              void foo() final override ;
+            };)cpp",
+          "void B::foo()   {}\n",
+      },
+      {
+          R"cpp(
+            struct A {
+              static void fo^o() {}
+            };)cpp",
+          R"cpp(
+            struct A {
+              static void foo() ;
+            };)cpp",
+          " void A::foo() {}\n",
+      },
+      {
+          R"cpp(
+            struct A {
+              static static void fo^o() {}
+            };)cpp",
+          R"cpp(
+            struct A {
+              static static void foo() ;
+            };)cpp",
+          "  void A::foo() {}\n",
+      },
+  };
+  for (const auto &Case : Cases) {
+    SCOPED_TRACE(Case.Test);
+    EXPECT_EQ(apply(Case.Test, &EditedFiles), Case.ExpectedHeader);
+    EXPECT_THAT(EditedFiles, testing::ElementsAre(FileWithContents(
+                                 testPath("Test.cpp"), Case.ExpectedSource)));
+  }
+}
+
+TEST_F(DefineOutlineTest, HandleMacros) {
+  llvm::StringMap<std::string> EditedFiles;
+  ExtraFiles["Test.cpp"] = "";
+  FileName = "Test.hpp";
+  ExtraArgs.push_back("-DVIRTUAL=virtual");
+  ExtraArgs.push_back("-DOVER=override");
+
+  struct {
+    llvm::StringRef Test;
+    llvm::StringRef ExpectedHeader;
+    llvm::StringRef ExpectedSource;
+  } Cases[] = {
+      {R"cpp(
+          #define BODY { return; }
+          void f^oo()BODY)cpp",
+       R"cpp(
+          #define BODY { return; }
+          void foo();)cpp",
+       "void foo()BODY"},
+
+      {R"cpp(
+          #define BODY return;
+          void f^oo(){BODY})cpp",
+       R"cpp(
+          #define BODY return;
+          void foo();)cpp",
+       "void foo(){BODY}"},
+
+      {R"cpp(
+          #define TARGET void foo()
+          [[TARGET]]{ return; })cpp",
+       R"cpp(
+          #define TARGET void foo()
+          TARGET;)cpp",
+       "TARGET{ return; }"},
+
+      {R"cpp(
+          #define TARGET foo
+          void [[TARGET]](){ return; })cpp",
+       R"cpp(
+          #define TARGET foo
+          void TARGET();)cpp",
+       "void TARGET(){ return; }"},
+      {R"cpp(#define VIRT virtual
+          struct A {
+            VIRT void f^oo() {}
+          };)cpp",
+       R"cpp(#define VIRT virtual
+          struct A {
+            VIRT void foo() ;
+          };)cpp",
+       " void A::foo() {}\n"},
+      {R"cpp(
+          struct A {
+            VIRTUAL void f^oo() {}
+          };)cpp",
+       R"cpp(
+          struct A {
+            VIRTUAL void foo() ;
+          };)cpp",
+       " void A::foo() {}\n"},
+      {R"cpp(
+          struct A {
+            virtual void foo() = 0;
+          };
+          struct B : A {
+            void fo^o() OVER {}
+          };)cpp",
+       R"cpp(
+          struct A {
+            virtual void foo() = 0;
+          };
+          struct B : A {
+            void foo() OVER ;
+          };)cpp",
+       "void B::foo()  {}\n"},
+      {R"cpp(#define STUPID_MACRO(X) virtual
+          struct A {
+            STUPID_MACRO(sizeof sizeof int) void f^oo() {}
+          };)cpp",
+       R"cpp(#define STUPID_MACRO(X) virtual
+          struct A {
+            STUPID_MACRO(sizeof sizeof int) void foo() ;
+          };)cpp",
+       " void A::foo() {}\n"},
+      {R"cpp(#define STAT static
+          struct A {
+            STAT void f^oo() {}
+          };)cpp",
+       R"cpp(#define STAT static
+          struct A {
+            STAT void foo() ;
+          };)cpp",
+       " void A::foo() {}\n"},
+      {R"cpp(#define STUPID_MACRO(X) static
+          struct A {
+            STUPID_MACRO(sizeof sizeof int) void f^oo() {}
+          };)cpp",
+       R"cpp(#define STUPID_MACRO(X) static
+          struct A {
+            STUPID_MACRO(sizeof sizeof int) void foo() ;
+          };)cpp",
+       " void A::foo() {}\n"},
+  };
+  for (const auto &Case : Cases) {
+    SCOPED_TRACE(Case.Test);
+    EXPECT_EQ(apply(Case.Test, &EditedFiles), Case.ExpectedHeader);
+    EXPECT_THAT(EditedFiles, testing::ElementsAre(FileWithContents(
+                                 testPath("Test.cpp"), Case.ExpectedSource)));
+  }
+}
+
+TEST_F(DefineOutlineTest, QualifyReturnValue) {
+  FileName = "Test.hpp";
+  ExtraFiles["Test.cpp"] = "";
+
+  struct {
+    llvm::StringRef Test;
+    llvm::StringRef ExpectedHeader;
+    llvm::StringRef ExpectedSource;
+  } Cases[] = {
+      {R"cpp(
+        namespace a { class Foo{}; }
+        using namespace a;
+        Foo fo^o() { return {}; })cpp",
+       R"cpp(
+        namespace a { class Foo{}; }
+        using namespace a;
+        Foo foo() ;)cpp",
+       "a::Foo foo() { return {}; }"},
+      {R"cpp(
+        namespace a {
+          class Foo {
+            class Bar {};
+            Bar fo^o() { return {}; }
+          };
+        })cpp",
+       R"cpp(
+        namespace a {
+          class Foo {
+            class Bar {};
+            Bar foo() ;
+          };
+        })cpp",
+       "a::Foo::Bar a::Foo::foo() { return {}; }\n"},
+      {R"cpp(
+        class Foo {};
+        Foo fo^o() { return {}; })cpp",
+       R"cpp(
+        class Foo {};
+        Foo foo() ;)cpp",
+       "Foo foo() { return {}; }"},
+  };
+  llvm::StringMap<std::string> EditedFiles;
+  for (auto &Case : Cases) {
+    apply(Case.Test, &EditedFiles);
+    EXPECT_EQ(apply(Case.Test, &EditedFiles), Case.ExpectedHeader);
+    EXPECT_THAT(EditedFiles, testing::ElementsAre(FileWithContents(
+                                 testPath("Test.cpp"), Case.ExpectedSource)));
+  }
+}
+
+TEST_F(DefineOutlineTest, QualifyFunctionName) {
+  FileName = "Test.hpp";
+  struct {
+    llvm::StringRef TestHeader;
+    llvm::StringRef TestSource;
+    llvm::StringRef ExpectedHeader;
+    llvm::StringRef ExpectedSource;
+  } Cases[] = {
+      {
+          R"cpp(
+            namespace a {
+              namespace b {
+                class Foo {
+                  void fo^o() {}
+                };
+              }
+            })cpp",
+          "",
+          R"cpp(
+            namespace a {
+              namespace b {
+                class Foo {
+                  void foo() ;
+                };
+              }
+            })cpp",
+          "void a::b::Foo::foo() {}\n",
+      },
+      {
+          "namespace a { namespace b { void f^oo() {} } }",
+          "namespace a{}",
+          "namespace a { namespace b { void foo() ; } }",
+          "namespace a{void b::foo() {} }",
+      },
+      {
+          "namespace a { namespace b { void f^oo() {} } }",
+          "using namespace a;",
+          "namespace a { namespace b { void foo() ; } }",
+          // FIXME: Take using namespace directives in the source file into
+          // account. This can be spelled as b::foo instead.
+          "using namespace a;void a::b::foo() {} ",
+      },
+  };
+  llvm::StringMap<std::string> EditedFiles;
+  for (auto &Case : Cases) {
+    ExtraFiles["Test.cpp"] = std::string(Case.TestSource);
+    EXPECT_EQ(apply(Case.TestHeader, &EditedFiles), Case.ExpectedHeader);
+    EXPECT_THAT(EditedFiles, testing::ElementsAre(FileWithContents(
+                                 testPath("Test.cpp"), Case.ExpectedSource)))
+        << Case.TestHeader;
+  }
+}
+
+TEST_F(DefineOutlineTest, FailsMacroSpecifier) {
+  FileName = "Test.hpp";
+  ExtraFiles["Test.cpp"] = "";
+  ExtraArgs.push_back("-DFINALOVER=final override");
+
+  std::pair<StringRef, StringRef> Cases[] = {
+      {
+          R"cpp(
+          #define VIRT virtual void
+          struct A {
+            VIRT fo^o() {}
+          };)cpp",
+          "fail: define outline: couldn't remove `virtual` keyword."},
+      {
+          R"cpp(
+          #define OVERFINAL final override
+          struct A {
+            virtual void foo() {}
+          };
+          struct B : A {
+            void fo^o() OVERFINAL {}
+          };)cpp",
+          "fail: define outline: Can't move out of line as function has a "
+          "macro `override` specifier.\ndefine outline: Can't move out of line "
+          "as function has a macro `final` specifier."},
+      {
+          R"cpp(
+          struct A {
+            virtual void foo() {}
+          };
+          struct B : A {
+            void fo^o() FINALOVER {}
+          };)cpp",
+          "fail: define outline: Can't move out of line as function has a "
+          "macro `override` specifier.\ndefine outline: Can't move out of line "
+          "as function has a macro `final` specifier."},
+  };
+  for (const auto &Case : Cases) {
+    EXPECT_EQ(apply(Case.first), Case.second);
+  }
+}
+
+} // namespace
+} // namespace clangd
+} // namespace clang

clang-tools-extra/clangd/unittests/tweaks/DumpASTTests.cpp

+//===-- DumpASTTests.cpp ----------------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "Annotations.h"
+#include "Config.h"
+#include "SourceCode.h"
+#include "TestFS.h"
+#include "TestTU.h"
+#include "TweakTesting.h"
+#include "refactor/Tweak.h"
+#include "clang/AST/Expr.h"
+#include "clang/Basic/Diagnostic.h"
+#include "clang/Basic/DiagnosticIDs.h"
+#include "clang/Basic/DiagnosticOptions.h"
+#include "clang/Basic/FileManager.h"
+#include "clang/Basic/FileSystemOptions.h"
+#include "clang/Basic/LLVM.h"
+#include "clang/Basic/SourceLocation.h"
+#include "clang/Basic/SourceManager.h"
+#include "clang/Rewrite/Core/Rewriter.h"
+#include "clang/Tooling/Core/Replacement.h"
+#include "llvm/ADT/IntrusiveRefCntPtr.h"
+#include "llvm/ADT/StringExtras.h"
+#include "llvm/ADT/StringMap.h"
+#include "llvm/ADT/StringRef.h"
+#include "llvm/Support/Error.h"
+#include "llvm/Support/MemoryBuffer.h"
+#include "llvm/Support/VirtualFileSystem.h"
+#include "llvm/Testing/Support/Error.h"
+#include "gmock/gmock-matchers.h"
+#include "gmock/gmock.h"
+#include "gtest/gtest.h"
+#include <cassert>
+#include <string>
+#include <utility>
+#include <vector>
+
+using ::testing::AllOf;
+using ::testing::HasSubstr;
+using ::testing::StartsWith;
+
+namespace clang {
+namespace clangd {
+namespace {
+
+TWEAK_TEST(DumpAST);
+
+TEST_F(DumpASTTest, Test) {
+  EXPECT_AVAILABLE("^int f^oo() { re^turn 2 ^+ 2; }");
+  EXPECT_UNAVAILABLE("/*c^omment*/ int foo() { return 2 ^ + 2; }");
+  EXPECT_THAT(apply("int x = 2 ^+ 2;"),
+              AllOf(StartsWith("message:"), HasSubstr("BinaryOperator"),
+                    HasSubstr("'+'"), HasSubstr("|-IntegerLiteral"),
+                    HasSubstr("<col:9> 'int' 2\n`-IntegerLiteral"),
+                    HasSubstr("<col:13> 'int' 2")));
+}
+
+} // namespace
+} // namespace clangd
+} // namespace clang

clang-tools-extra/clangd/unittests/tweaks/DumpRecordLayoutTests.cpp

+//===-- DumpRecordLayoutTests.cpp -------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "Annotations.h"
+#include "Config.h"
+#include "SourceCode.h"
+#include "TestFS.h"
+#include "TestTU.h"
+#include "TweakTesting.h"
+#include "refactor/Tweak.h"
+#include "clang/AST/Expr.h"
+#include "clang/Basic/Diagnostic.h"
+#include "clang/Basic/DiagnosticIDs.h"
+#include "clang/Basic/DiagnosticOptions.h"
+#include "clang/Basic/FileManager.h"
+#include "clang/Basic/FileSystemOptions.h"
+#include "clang/Basic/LLVM.h"
+#include "clang/Basic/SourceLocation.h"
+#include "clang/Basic/SourceManager.h"
+#include "clang/Rewrite/Core/Rewriter.h"
+#include "clang/Tooling/Core/Replacement.h"
+#include "llvm/ADT/IntrusiveRefCntPtr.h"
+#include "llvm/ADT/StringExtras.h"
+#include "llvm/ADT/StringMap.h"
+#include "llvm/ADT/StringRef.h"
+#include "llvm/Support/Error.h"
+#include "llvm/Support/MemoryBuffer.h"
+#include "llvm/Support/VirtualFileSystem.h"
+#include "llvm/Testing/Support/Error.h"
+#include "gmock/gmock-matchers.h"
+#include "gmock/gmock.h"
+#include "gtest/gtest.h"
+#include <cassert>
+#include <string>
+#include <utility>
+#include <vector>
+
+using ::testing::AllOf;
+using ::testing::HasSubstr;
+using ::testing::StartsWith;
+
+namespace clang {
+namespace clangd {
+namespace {
+
+TWEAK_TEST(DumpRecordLayout);
+
+TEST_F(DumpRecordLayoutTest, Test) {
+  EXPECT_AVAILABLE("^s^truct ^X ^{ int x; ^};");
+  EXPECT_THAT("struct X { int ^a; };", Not(isAvailable()));
+  EXPECT_THAT("struct ^X;", Not(isAvailable()));
+  EXPECT_THAT("template <typename T> struct ^X { T t; };", Not(isAvailable()));
+  EXPECT_THAT("enum ^X {};", Not(isAvailable()));
+
+  EXPECT_THAT(apply("struct ^X { int x; int y; };"),
+              AllOf(StartsWith("message:"), HasSubstr("0 |   int x")));
+}
+
+} // namespace
+} // namespace clangd
+} // namespace clang

clang-tools-extra/clangd/unittests/tweaks/DumpSymbolTests.cpp

+//===-- DumpSymbolTests.cpp -------------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "Annotations.h"
+#include "Config.h"
+#include "SourceCode.h"
+#include "TestFS.h"
+#include "TestTU.h"
+#include "TweakTesting.h"
+#include "refactor/Tweak.h"
+#include "clang/AST/Expr.h"
+#include "clang/Basic/Diagnostic.h"
+#include "clang/Basic/DiagnosticIDs.h"
+#include "clang/Basic/DiagnosticOptions.h"
+#include "clang/Basic/FileManager.h"
+#include "clang/Basic/FileSystemOptions.h"
+#include "clang/Basic/LLVM.h"
+#include "clang/Basic/SourceLocation.h"
+#include "clang/Basic/SourceManager.h"
+#include "clang/Rewrite/Core/Rewriter.h"
+#include "clang/Tooling/Core/Replacement.h"
+#include "llvm/ADT/IntrusiveRefCntPtr.h"
+#include "llvm/ADT/StringExtras.h"
+#include "llvm/ADT/StringMap.h"
+#include "llvm/ADT/StringRef.h"
+#include "llvm/Support/Error.h"
+#include "llvm/Support/MemoryBuffer.h"
+#include "llvm/Support/VirtualFileSystem.h"
+#include "llvm/Testing/Support/Error.h"
+#include "gmock/gmock-matchers.h"
+#include "gmock/gmock.h"
+#include "gtest/gtest.h"
+#include <cassert>
+#include <string>
+#include <utility>
+#include <vector>
+
+using ::testing::AllOf;
+using ::testing::HasSubstr;
+using ::testing::StartsWith;
+
+namespace clang {
+namespace clangd {
+namespace {
+
+TWEAK_TEST(DumpSymbol);
+
+TEST_F(DumpSymbolTest, Test) {
+  std::string ID = R"("id":"CA2EBE44A1D76D2A")";
+  std::string USR = R"("usr":"c:@F@foo#")";
+  EXPECT_THAT(apply("void f^oo();"),
+              AllOf(StartsWith("message:"), testing::HasSubstr(ID),
+                    testing::HasSubstr(USR)));
+}
+
+} // namespace
+} // namespace clangd
+} // namespace clang

clang-tools-extra/clangd/unittests/tweaks/ExpandAutoTypeTests.cpp

+//===-- ExpandAutoTypeTests.cpp ---------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "Annotations.h"
+#include "Config.h"
+#include "SourceCode.h"
+#include "TestFS.h"
+#include "TestTU.h"
+#include "TweakTesting.h"
+#include "refactor/Tweak.h"
+#include "clang/AST/Expr.h"
+#include "clang/Basic/Diagnostic.h"
+#include "clang/Basic/DiagnosticIDs.h"
+#include "clang/Basic/DiagnosticOptions.h"
+#include "clang/Basic/FileManager.h"
+#include "clang/Basic/FileSystemOptions.h"
+#include "clang/Basic/LLVM.h"
+#include "clang/Basic/SourceLocation.h"
+#include "clang/Basic/SourceManager.h"
+#include "clang/Rewrite/Core/Rewriter.h"
+#include "clang/Tooling/Core/Replacement.h"
+#include "llvm/ADT/IntrusiveRefCntPtr.h"
+#include "llvm/ADT/StringExtras.h"
+#include "llvm/ADT/StringMap.h"
+#include "llvm/ADT/StringRef.h"
+#include "llvm/Support/Error.h"
+#include "llvm/Support/MemoryBuffer.h"
+#include "llvm/Support/VirtualFileSystem.h"
+#include "llvm/Testing/Support/Error.h"
+#include "gmock/gmock-matchers.h"
+#include "gmock/gmock.h"
+#include "gtest/gtest.h"
+#include <cassert>
+#include <string>
+#include <utility>
+#include <vector>
+
+using ::testing::StartsWith;
+
+namespace clang {
+namespace clangd {
+namespace {
+
+TWEAK_TEST(ExpandAutoType);
+
+TEST_F(ExpandAutoTypeTest, Test) {
+  Header = R"cpp(
+    namespace ns {
+      struct Class {
+        struct Nested {};
+      };
+      void Func();
+    }
+    inline namespace inl_ns {
+      namespace {
+        struct Visible {};
+      }
+    }
+  )cpp";
+
+  EXPECT_AVAILABLE("^a^u^t^o^ i = 0;");
+  EXPECT_UNAVAILABLE("auto ^i^ ^=^ ^0^;^");
+
+  // check primitive type
+  EXPECT_EQ(apply("[[auto]] i = 0;"), "int i = 0;");
+  EXPECT_EQ(apply("au^to i = 0;"), "int i = 0;");
+  // check classes and namespaces
+  EXPECT_EQ(apply("^auto C = ns::Class::Nested();"),
+            "ns::Class::Nested C = ns::Class::Nested();");
+  // check that namespaces are shortened
+  EXPECT_EQ(apply("namespace ns { void f() { ^auto C = Class(); } }"),
+            "namespace ns { void f() { Class C = Class(); } }");
+  // undefined functions should not be replaced
+  EXPECT_THAT(apply("au^to x = doesnt_exist(); // error-ok"),
+              StartsWith("fail: Could not deduce type for 'auto' type"));
+  // function pointers should not be replaced
+  EXPECT_THAT(apply("au^to x = &ns::Func;"),
+              StartsWith("fail: Could not expand type of function pointer"));
+  // lambda types are not replaced
+  EXPECT_UNAVAILABLE("au^to x = []{};");
+  // inline namespaces
+  EXPECT_EQ(apply("au^to x = inl_ns::Visible();"),
+            "Visible x = inl_ns::Visible();");
+  // local class
+  EXPECT_EQ(apply("namespace x { void y() { struct S{}; ^auto z = S(); } }"),
+            "namespace x { void y() { struct S{}; S z = S(); } }");
+  // replace array types
+  EXPECT_EQ(apply(R"cpp(au^to x = "test";)cpp"),
+            R"cpp(const char * x = "test";)cpp");
+
+  EXPECT_UNAVAILABLE("dec^ltype(au^to) x = 10;");
+  // expanding types in structured bindings is syntactically invalid.
+  EXPECT_UNAVAILABLE("const ^auto &[x,y] = (int[]){1,2};");
+
+  // FIXME: Auto-completion in a template requires disabling delayed template
+  // parsing.
+  ExtraArgs.push_back("-fno-delayed-template-parsing");
+  // unknown types in a template should not be replaced
+  EXPECT_THAT(apply("template <typename T> void x() { ^auto y = T::z(); }"),
+              StartsWith("fail: Could not deduce type for 'auto' type"));
+}
+
+} // namespace
+} // namespace clangd
+} // namespace clang

clang-tools-extra/clangd/unittests/tweaks/ExpandMacroTests.cpp

+//===-- ExpandMacroTests.cpp ------------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "Annotations.h"
+#include "Config.h"
+#include "SourceCode.h"
+#include "TestFS.h"
+#include "TestTU.h"
+#include "TweakTesting.h"
+#include "refactor/Tweak.h"
+#include "clang/AST/Expr.h"
+#include "clang/Basic/Diagnostic.h"
+#include "clang/Basic/DiagnosticIDs.h"
+#include "clang/Basic/DiagnosticOptions.h"
+#include "clang/Basic/FileManager.h"
+#include "clang/Basic/FileSystemOptions.h"
+#include "clang/Basic/LLVM.h"
+#include "clang/Basic/SourceLocation.h"
+#include "clang/Basic/SourceManager.h"
+#include "clang/Rewrite/Core/Rewriter.h"
+#include "clang/Tooling/Core/Replacement.h"
+#include "llvm/ADT/IntrusiveRefCntPtr.h"
+#include "llvm/ADT/StringExtras.h"
+#include "llvm/ADT/StringMap.h"
+#include "llvm/ADT/StringRef.h"
+#include "llvm/Support/Error.h"
+#include "llvm/Support/MemoryBuffer.h"
+#include "llvm/Support/VirtualFileSystem.h"
+#include "llvm/Testing/Support/Error.h"
+#include "gmock/gmock-matchers.h"
+#include "gmock/gmock.h"
+#include "gtest/gtest.h"
+#include <cassert>
+#include <string>
+#include <utility>
+#include <vector>
+
+namespace clang {
+namespace clangd {
+namespace {
+
+TWEAK_TEST(ExpandMacro);
+
+TEST_F(ExpandMacroTest, Test) {
+  Header = R"cpp(
+    // error-ok: not real c++, just token manipulation
+    #define FOO 1 2 3
+    #define FUNC(X) X+X+X
+    #define EMPTY
+    #define EMPTY_FN(X)
+  )cpp";
+
+  // Available on macro names, not available anywhere else.
+  EXPECT_AVAILABLE("^F^O^O^ BAR ^F^O^O^");
+  EXPECT_AVAILABLE("^F^U^N^C^(1)");
+  EXPECT_UNAVAILABLE("^#^d^efine^ ^XY^Z 1 ^2 ^3^");
+  EXPECT_UNAVAILABLE("FOO ^B^A^R^ FOO ^");
+  EXPECT_UNAVAILABLE("FUNC(^1^)^");
+
+  // Works as expected on object-like macros.
+  EXPECT_EQ(apply("^FOO BAR FOO"), "1 2 3 BAR FOO");
+  EXPECT_EQ(apply("FOO BAR ^FOO"), "FOO BAR 1 2 3");
+  // And function-like macros.
+  EXPECT_EQ(apply("F^UNC(2)"), "2 + 2 + 2");
+
+  // Works on empty macros.
+  EXPECT_EQ(apply("int a ^EMPTY;"), "int a ;");
+  EXPECT_EQ(apply("int a ^EMPTY_FN(1 2 3);"), "int a ;");
+  EXPECT_EQ(apply("int a = 123 ^EMPTY EMPTY_FN(1);"),
+            "int a = 123  EMPTY_FN(1);");
+  EXPECT_EQ(apply("int a = 123 ^EMPTY_FN(1) EMPTY;"), "int a = 123  EMPTY;");
+  EXPECT_EQ(apply("int a = 123 EMPTY_FN(1) ^EMPTY;"),
+            "int a = 123 EMPTY_FN(1) ;");
+}
+
+} // namespace
+} // namespace clangd
+} // namespace clang

clang-tools-extra/clangd/unittests/tweaks/ExtractFunctionTests.cpp

+//===-- ExtractFunctionTests.cpp --------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "Annotations.h"
+#include "Config.h"
+#include "SourceCode.h"
+#include "TestFS.h"
+#include "TestTU.h"
+#include "TweakTesting.h"
+#include "refactor/Tweak.h"
+#include "clang/AST/Expr.h"
+#include "clang/Basic/Diagnostic.h"
+#include "clang/Basic/DiagnosticIDs.h"
+#include "clang/Basic/DiagnosticOptions.h"
+#include "clang/Basic/FileManager.h"
+#include "clang/Basic/FileSystemOptions.h"
+#include "clang/Basic/LLVM.h"
+#include "clang/Basic/SourceLocation.h"
+#include "clang/Basic/SourceManager.h"
+#include "clang/Rewrite/Core/Rewriter.h"
+#include "clang/Tooling/Core/Replacement.h"
+#include "llvm/ADT/IntrusiveRefCntPtr.h"
+#include "llvm/ADT/StringExtras.h"
+#include "llvm/ADT/StringMap.h"
+#include "llvm/ADT/StringRef.h"
+#include "llvm/Support/Error.h"
+#include "llvm/Support/MemoryBuffer.h"
+#include "llvm/Support/VirtualFileSystem.h"
+#include "llvm/Testing/Support/Error.h"
+#include "gmock/gmock-matchers.h"
+#include "gmock/gmock.h"
+#include "gtest/gtest.h"
+#include <cassert>
+#include <string>
+#include <utility>
+#include <vector>
+
+using ::testing::HasSubstr;
+using ::testing::StartsWith;
+
+namespace clang {
+namespace clangd {
+namespace {
+
+TWEAK_TEST(ExtractFunction);
+
+TEST_F(ExtractFunctionTest, FunctionTest) {
+  Context = Function;
+
+  // Root statements should have common parent.
+  EXPECT_EQ(apply("for(;;) [[1+2; 1+2;]]"), "unavailable");
+  // Expressions aren't extracted.
+  EXPECT_EQ(apply("int x = 0; [[x++;]]"), "unavailable");
+  // We don't support extraction from lambdas.
+  EXPECT_EQ(apply("auto lam = [](){ [[int x;]] }; "), "unavailable");
+  // Partial statements aren't extracted.
+  EXPECT_THAT(apply("int [[x = 0]];"), "unavailable");
+  // FIXME: Support hoisting.
+  EXPECT_THAT(apply(" [[int a = 5;]] a++; "), "unavailable");
+
+  // Ensure that end of Zone and Beginning of PostZone being adjacent doesn't
+  // lead to break being included in the extraction zone.
+  EXPECT_THAT(apply("for(;;) { [[int x;]]break; }"), HasSubstr("extracted"));
+  // FIXME: ExtractFunction should be unavailable inside loop construct
+  // initializer/condition.
+  EXPECT_THAT(apply(" for([[int i = 0;]];);"), HasSubstr("extracted"));
+  // Extract certain return
+  EXPECT_THAT(apply(" if(true) [[{ return; }]] "), HasSubstr("extracted"));
+  // Don't extract uncertain return
+  EXPECT_THAT(apply(" if(true) [[if (false) return;]] "),
+              StartsWith("unavailable"));
+  EXPECT_THAT(
+      apply("#define RETURN_IF_ERROR(x) if (x) return\nRETU^RN_IF_ERROR(4);"),
+      StartsWith("unavailable"));
+
+  FileName = "a.c";
+  EXPECT_THAT(apply(" for([[int i = 0;]];);"), HasSubstr("unavailable"));
+}
+
+TEST_F(ExtractFunctionTest, FileTest) {
+  // Check all parameters are in order
+  std::string ParameterCheckInput = R"cpp(
+struct Foo {
+  int x;
+};
+void f(int a) {
+  int b;
+  int *ptr = &a;
+  Foo foo;
+  [[a += foo.x + b;
+  *ptr++;]]
+})cpp";
+  std::string ParameterCheckOutput = R"cpp(
+struct Foo {
+  int x;
+};
+void extracted(int &a, int &b, int * &ptr, Foo &foo) {
+a += foo.x + b;
+  *ptr++;
+}
+void f(int a) {
+  int b;
+  int *ptr = &a;
+  Foo foo;
+  extracted(a, b, ptr, foo);
+})cpp";
+  EXPECT_EQ(apply(ParameterCheckInput), ParameterCheckOutput);
+
+  // Check const qualifier
+  std::string ConstCheckInput = R"cpp(
+void f(const int c) {
+  [[while(c) {}]]
+})cpp";
+  std::string ConstCheckOutput = R"cpp(
+void extracted(const int &c) {
+while(c) {}
+}
+void f(const int c) {
+  extracted(c);
+})cpp";
+  EXPECT_EQ(apply(ConstCheckInput), ConstCheckOutput);
+
+  // Don't extract when we need to make a function as a parameter.
+  EXPECT_THAT(apply("void f() { [[int a; f();]] }"), StartsWith("fail"));
+
+  // We don't extract from methods for now since they may involve multi-file
+  // edits
+  std::string MethodFailInput = R"cpp(
+    class T {
+      void f() {
+        [[int x;]]
+      }
+    };
+  )cpp";
+  EXPECT_EQ(apply(MethodFailInput), "unavailable");
+
+  // We don't extract from templated functions for now as templates are hard
+  // to deal with.
+  std::string TemplateFailInput = R"cpp(
+    template<typename T>
+    void f() {
+      [[int x;]]
+    }
+  )cpp";
+  EXPECT_EQ(apply(TemplateFailInput), "unavailable");
+
+  std::string MacroInput = R"cpp(
+    #define F(BODY) void f() { BODY }
+    F ([[int x = 0;]])
+  )cpp";
+  std::string MacroOutput = R"cpp(
+    #define F(BODY) void f() { BODY }
+    void extracted() {
+int x = 0;
+}
+F (extracted();)
+  )cpp";
+  EXPECT_EQ(apply(MacroInput), MacroOutput);
+
+  // Shouldn't crash.
+  EXPECT_EQ(apply("void f([[int a]]);"), "unavailable");
+  // Don't extract if we select the entire function body (CompoundStmt).
+  std::string CompoundFailInput = R"cpp(
+    void f() [[{
+      int a;
+    }]]
+  )cpp";
+  EXPECT_EQ(apply(CompoundFailInput), "unavailable");
+}
+
+TEST_F(ExtractFunctionTest, ControlFlow) {
+  Context = Function;
+  // We should be able to extract break/continue with a parent loop/switch.
+  EXPECT_THAT(apply(" [[for(;;) if(1) break;]] "), HasSubstr("extracted"));
+  EXPECT_THAT(apply(" for(;;) [[while(1) break;]] "), HasSubstr("extracted"));
+  EXPECT_THAT(apply(" [[switch(1) { break; }]]"), HasSubstr("extracted"));
+  EXPECT_THAT(apply(" [[while(1) switch(1) { continue; }]]"),
+              HasSubstr("extracted"));
+  // Don't extract break and continue without a loop/switch parent.
+  EXPECT_THAT(apply(" for(;;) [[if(1) continue;]] "), StartsWith("fail"));
+  EXPECT_THAT(apply(" while(1) [[if(1) break;]] "), StartsWith("fail"));
+  EXPECT_THAT(apply(" switch(1) { [[break;]] }"), StartsWith("fail"));
+  EXPECT_THAT(apply(" for(;;) { [[while(1) break; break;]] }"),
+              StartsWith("fail"));
+}
+
+TEST_F(ExtractFunctionTest, ExistingReturnStatement) {
+  Context = File;
+  const char *Before = R"cpp(
+    bool lucky(int N);
+    int getNum(bool Superstitious, int Min, int Max) {
+      if (Superstitious) [[{
+        for (int I = Min; I <= Max; ++I)
+          if (lucky(I))
+            return I;
+        return -1;
+      }]] else {
+        return (Min + Max) / 2;
+      }
+    }
+  )cpp";
+  // FIXME: min/max should be by value.
+  // FIXME: avoid emitting redundant braces
+  const char *After = R"cpp(
+    bool lucky(int N);
+    int extracted(int &Min, int &Max) {
+{
+        for (int I = Min; I <= Max; ++I)
+          if (lucky(I))
+            return I;
+        return -1;
+      }
+}
+int getNum(bool Superstitious, int Min, int Max) {
+      if (Superstitious) return extracted(Min, Max); else {
+        return (Min + Max) / 2;
+      }
+    }
+  )cpp";
+  EXPECT_EQ(apply(Before), After);
+}
+
+} // namespace
+} // namespace clangd
+} // namespace clang

clang-tools-extra/clangd/unittests/tweaks/ExtractVariableTests.cpp

+//===-- ExtractVariableTests.cpp --------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "Annotations.h"
+#include "Config.h"
+#include "SourceCode.h"
+#include "TestFS.h"
+#include "TestTU.h"
+#include "TweakTesting.h"
+#include "refactor/Tweak.h"
+#include "clang/AST/Expr.h"
+#include "clang/Basic/Diagnostic.h"
+#include "clang/Basic/DiagnosticIDs.h"
+#include "clang/Basic/DiagnosticOptions.h"
+#include "clang/Basic/FileManager.h"
+#include "clang/Basic/FileSystemOptions.h"
+#include "clang/Basic/LLVM.h"
+#include "clang/Basic/SourceLocation.h"
+#include "clang/Basic/SourceManager.h"
+#include "clang/Rewrite/Core/Rewriter.h"
+#include "clang/Tooling/Core/Replacement.h"
+#include "llvm/ADT/IntrusiveRefCntPtr.h"
+#include "llvm/ADT/StringExtras.h"
+#include "llvm/ADT/StringMap.h"
+#include "llvm/ADT/StringRef.h"
+#include "llvm/Support/Error.h"
+#include "llvm/Support/MemoryBuffer.h"
+#include "llvm/Support/VirtualFileSystem.h"
+#include "llvm/Testing/Support/Error.h"
+#include "gmock/gmock-matchers.h"
+#include "gmock/gmock.h"
+#include "gtest/gtest.h"
+#include <cassert>
+#include <string>
+#include <utility>
+#include <vector>
+
+using ::testing::StartsWith;
+
+namespace clang {
+namespace clangd {
+namespace {
+
+TWEAK_TEST(ExtractVariable);
+TEST_F(ExtractVariableTest, Test) {
+  const char *AvailableCases = R"cpp(
+    int xyz(int a = 1) {
+      struct T {
+        int bar(int a = 1);
+        int z;
+      } t;
+      // return statement
+      return [[[[t.b[[a]]r]](t.z)]];
+    }
+    void f() {
+      int a = [[5 +]] [[4 * [[[[xyz]]()]]]];
+      // multivariable initialization
+      if(1)
+        int x = [[1]], y = [[a + 1]], a = [[1]], z = a + 1;
+      // if without else
+      if([[1]])
+        a = [[1]] + 1;
+      // if with else
+      if(a < [[3]])
+        if(a == [[4]])
+          a = [[5]] + 1;
+        else
+          a = [[5]] + 1;
+      else if (a < [[4]])
+        a = [[4]] + 1;
+      else
+        a = [[5]] + 1;
+      // for loop
+      for(a = [[1]] + 1; a > [[[[3]] + [[4]]]]; a++)
+        a = [[2]] + 1;
+      // while
+      while(a < [[1]])
+        a = [[1]] + 1;
+      // do while
+      do
+        a = [[1]] + 1;
+      while(a < [[3]]);
+    }
+  )cpp";
+  EXPECT_AVAILABLE(AvailableCases);
+
+  ExtraArgs = {"-xc"};
+  const char *AvailableButC = R"cpp(
+    void foo() {
+      int x = [[1]];
+    })cpp";
+  EXPECT_UNAVAILABLE(AvailableButC);
+  ExtraArgs = {};
+
+  const char *NoCrashCases = R"cpp(
+    // error-ok: broken code, but shouldn't crash
+    template<typename T, typename ...Args>
+    struct Test<T, Args...> {
+    Test(const T &v) :val[[(^]]) {}
+      T val;
+    };
+  )cpp";
+  EXPECT_UNAVAILABLE(NoCrashCases);
+
+  const char *UnavailableCases = R"cpp(
+    int xyz(int a = [[1]]) {
+      struct T {
+        int bar(int a = [[1]]);
+        int z = [[1]];
+      } t;
+      return [[t]].bar([[[[t]].z]]);
+    }
+    void v() { return; }
+    // function default argument
+    void f(int b = [[1]]) {
+      // empty selection
+      int a = ^1 ^+ ^2;
+      // void expressions
+      auto i = new int, j = new int;
+      [[[[delete i]], delete j]];
+      [[v]]();
+      // if
+      if(1)
+        int x = 1, y = a + 1, a = 1, z = [[a + 1]];
+      if(int a = 1)
+        if([[a + 1]] == 4)
+          a = [[[[a]] +]] 1;
+      // for loop
+      for(int a = 1, b = 2, c = 3; a > [[b + c]]; [[a++]])
+        a = [[a + 1]];
+      // lambda
+      auto lamb = [&[[a]], &[[b]]](int r = [[1]]) {return 1;};
+      // assignment
+      xyz([[a = 5]]);
+      xyz([[a *= 5]]);
+      // Variable DeclRefExpr
+      a = [[b]];
+      a = [[xyz()]];
+      // statement expression
+      [[xyz()]];
+      while (a)
+        [[++a]];
+      // label statement
+      goto label;
+      label:
+        a = [[1]];
+    }
+  )cpp";
+  EXPECT_UNAVAILABLE(UnavailableCases);
+
+  // vector of pairs of input and output strings
+  const std::vector<std::pair<std::string, std::string>> InputOutputs = {
+      // extraction from variable declaration/assignment
+      {R"cpp(void varDecl() {
+                   int a = 5 * (4 + (3 [[- 1)]]);
+                 })cpp",
+       R"cpp(void varDecl() {
+                   auto dummy = (3 - 1); int a = 5 * (4 + dummy);
+                 })cpp"},
+      // FIXME: extraction from switch case
+      /*{R"cpp(void f(int a) {
+               if(1)
+                 while(a < 1)
+                   switch (1) {
+                       case 1:
+                         a = [[1 + 2]];
+                         break;
+                       default:
+                         break;
+                   }
+             })cpp",
+       R"cpp(void f(int a) {
+               auto dummy = 1 + 2; if(1)
+                 while(a < 1)
+                   switch (1) {
+                       case 1:
+                         a = dummy;
+                         break;
+                       default:
+                         break;
+                   }
+             })cpp"},*/
+      // Macros
+      {R"cpp(#define PLUS(x) x++
+                 void f(int a) {
+                   int y = PLUS([[1+a]]);
+                 })cpp",
+       /*FIXME: It should be extracted like this.
+        R"cpp(#define PLUS(x) x++
+              void f(int a) {
+                auto dummy = 1+a; int y = PLUS(dummy);
+              })cpp"},*/
+       R"cpp(#define PLUS(x) x++
+                 void f(int a) {
+                   auto dummy = PLUS(1+a); int y = dummy;
+                 })cpp"},
+      // ensure InsertionPoint isn't inside a macro
+      {R"cpp(#define LOOP(x) while (1) {a = x;}
+                 void f(int a) {
+                   if(1)
+                    LOOP(5 + [[3]])
+                 })cpp",
+       R"cpp(#define LOOP(x) while (1) {a = x;}
+                 void f(int a) {
+                   auto dummy = 3; if(1)
+                    LOOP(5 + dummy)
+                 })cpp"},
+      {R"cpp(#define LOOP(x) do {x;} while(1);
+                 void f(int a) {
+                   if(1)
+                    LOOP(5 + [[3]])
+                 })cpp",
+       R"cpp(#define LOOP(x) do {x;} while(1);
+                 void f(int a) {
+                   auto dummy = 3; if(1)
+                    LOOP(5 + dummy)
+                 })cpp"},
+      // attribute testing
+      {R"cpp(void f(int a) {
+                    [ [gsl::suppress("type")] ] for (;;) a = [[1]] + 1;
+                 })cpp",
+       R"cpp(void f(int a) {
+                    auto dummy = 1; [ [gsl::suppress("type")] ] for (;;) a = dummy + 1;
+                 })cpp"},
+      // MemberExpr
+      {R"cpp(class T {
+                   T f() {
+                     return [[T().f()]].f();
+                   }
+                 };)cpp",
+       R"cpp(class T {
+                   T f() {
+                     auto dummy = T().f(); return dummy.f();
+                   }
+                 };)cpp"},
+      // Function DeclRefExpr
+      {R"cpp(int f() {
+                   return [[f]]();
+                 })cpp",
+       R"cpp(int f() {
+                   auto dummy = f(); return dummy;
+                 })cpp"},
+      // FIXME: Wrong result for \[\[clang::uninitialized\]\] int b = [[1]];
+      // since the attr is inside the DeclStmt and the bounds of
+      // DeclStmt don't cover the attribute.
+
+      // Binary subexpressions
+      {R"cpp(void f() {
+                   int x = 1 + [[2 + 3 + 4]] + 5;
+                 })cpp",
+       R"cpp(void f() {
+                   auto dummy = 2 + 3 + 4; int x = 1 + dummy + 5;
+                 })cpp"},
+      {R"cpp(void f() {
+                   int x = [[1 + 2 + 3]] + 4 + 5;
+                 })cpp",
+       R"cpp(void f() {
+                   auto dummy = 1 + 2 + 3; int x = dummy + 4 + 5;
+                 })cpp"},
+      {R"cpp(void f() {
+                   int x = 1 + 2 + [[3 + 4 + 5]];
+                 })cpp",
+       R"cpp(void f() {
+                   auto dummy = 3 + 4 + 5; int x = 1 + 2 + dummy;
+                 })cpp"},
+      // Non-associative operations have no special support
+      {R"cpp(void f() {
+                   int x = 1 - [[2 - 3 - 4]] - 5;
+                 })cpp",
+       R"cpp(void f() {
+                   auto dummy = 1 - 2 - 3 - 4; int x = dummy - 5;
+                 })cpp"},
+      // A mix of associative operators isn't associative.
+      {R"cpp(void f() {
+                   int x = 0 + 1 * [[2 + 3]] * 4 + 5;
+                 })cpp",
+       R"cpp(void f() {
+                   auto dummy = 1 * 2 + 3 * 4; int x = 0 + dummy + 5;
+                 })cpp"},
+      // Overloaded operators are supported, we assume associativity
+      // as if they were built-in.
+      {R"cpp(struct S {
+                   S(int);
+                 };
+                 S operator+(S, S);
+
+                 void f() {
+                   S x = S(1) + [[S(2) + S(3) + S(4)]] + S(5);
+                 })cpp",
+       R"cpp(struct S {
+                   S(int);
+                 };
+                 S operator+(S, S);
+
+                 void f() {
+                   auto dummy = S(2) + S(3) + S(4); S x = S(1) + dummy + S(5);
+                 })cpp"},
+      // Don't try to analyze across macro boundaries
+      // FIXME: it'd be nice to do this someday (in a safe way)
+      {R"cpp(#define ECHO(X) X
+                 void f() {
+                   int x = 1 + [[ECHO(2 + 3) + 4]] + 5;
+                 })cpp",
+       R"cpp(#define ECHO(X) X
+                 void f() {
+                   auto dummy = 1 + ECHO(2 + 3) + 4; int x = dummy + 5;
+                 })cpp"},
+      {R"cpp(#define ECHO(X) X
+                 void f() {
+                   int x = 1 + [[ECHO(2) + ECHO(3) + 4]] + 5;
+                 })cpp",
+       R"cpp(#define ECHO(X) X
+                 void f() {
+                   auto dummy = 1 + ECHO(2) + ECHO(3) + 4; int x = dummy + 5;
+                 })cpp"},
+  };
+  for (const auto &IO : InputOutputs) {
+    EXPECT_EQ(IO.second, apply(IO.first)) << IO.first;
+  }
+}
+
+} // namespace
+} // namespace clangd
+} // namespace clang

clang-tools-extra/clangd/unittests/tweaks/ObjCLocalizeStringLiteralTests.cpp

+//===-- ObjCLocalizeStringLiteralTests.cpp ----------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "Annotations.h"
+#include "Config.h"
+#include "SourceCode.h"
+#include "TestFS.h"
+#include "TestTU.h"
+#include "TweakTesting.h"
+#include "refactor/Tweak.h"
+#include "clang/AST/Expr.h"
+#include "clang/Basic/Diagnostic.h"
+#include "clang/Basic/DiagnosticIDs.h"
+#include "clang/Basic/DiagnosticOptions.h"
+#include "clang/Basic/FileManager.h"
+#include "clang/Basic/FileSystemOptions.h"
+#include "clang/Basic/LLVM.h"
+#include "clang/Basic/SourceLocation.h"
+#include "clang/Basic/SourceManager.h"
+#include "clang/Rewrite/Core/Rewriter.h"
+#include "clang/Tooling/Core/Replacement.h"
+#include "llvm/ADT/IntrusiveRefCntPtr.h"
+#include "llvm/ADT/StringExtras.h"
+#include "llvm/ADT/StringMap.h"
+#include "llvm/ADT/StringRef.h"
+#include "llvm/Support/Error.h"
+#include "llvm/Support/MemoryBuffer.h"
+#include "llvm/Support/VirtualFileSystem.h"
+#include "llvm/Testing/Support/Error.h"
+#include "gmock/gmock-matchers.h"
+#include "gmock/gmock.h"
+#include "gtest/gtest.h"
+#include <cassert>
+#include <string>
+#include <utility>
+#include <vector>
+
+namespace clang {
+namespace clangd {
+namespace {
+
+TWEAK_TEST(ObjCLocalizeStringLiteral);
+
+TEST_F(ObjCLocalizeStringLiteralTest, Test) {
+  ExtraArgs.push_back("-x");
+  ExtraArgs.push_back("objective-c");
+
+  // Ensure the action can be initiated in the string literal.
+  EXPECT_AVAILABLE(R"(id x = ^[[@[[^"^t^est^"]]]];)");
+
+  // Ensure that the action can't be initiated in other places.
+  EXPECT_UNAVAILABLE(R"([[i^d ^[[x]] ^= @"test";^]])");
+
+  // Ensure that the action is not available for regular C strings.
+  EXPECT_UNAVAILABLE(R"(const char * x= "^test";)");
+
+  const char *Input = R"(id x = [[@"test"]];)";
+  const char *Output = R"(id x = NSLocalizedString(@"test", @"");)";
+  EXPECT_EQ(apply(Input), Output);
+}
+
+} // namespace
+} // namespace clangd
+} // namespace clang

clang-tools-extra/clangd/unittests/tweaks/PopulateSwitchTests.cpp

+//===-- PopulateSwitchTest.cpp ----------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "Annotations.h"
+#include "Config.h"
+#include "SourceCode.h"
+#include "TestFS.h"
+#include "TestTU.h"
+#include "TweakTesting.h"
+#include "refactor/Tweak.h"
+#include "clang/AST/Expr.h"
+#include "clang/Basic/Diagnostic.h"
+#include "clang/Basic/DiagnosticIDs.h"
+#include "clang/Basic/DiagnosticOptions.h"
+#include "clang/Basic/FileManager.h"
+#include "clang/Basic/FileSystemOptions.h"
+#include "clang/Basic/LLVM.h"
+#include "clang/Basic/SourceLocation.h"
+#include "clang/Basic/SourceManager.h"
+#include "clang/Rewrite/Core/Rewriter.h"
+#include "clang/Tooling/Core/Replacement.h"
+#include "llvm/ADT/IntrusiveRefCntPtr.h"
+#include "llvm/ADT/StringExtras.h"
+#include "llvm/ADT/StringMap.h"
+#include "llvm/ADT/StringRef.h"
+#include "llvm/Support/Error.h"
+#include "llvm/Support/MemoryBuffer.h"
+#include "llvm/Support/VirtualFileSystem.h"
+#include "llvm/Testing/Support/Error.h"
+#include "gmock/gmock-matchers.h"
+#include "gmock/gmock.h"
+#include "gtest/gtest.h"
+#include <cassert>
+#include <string>
+#include <utility>
+#include <vector>
+
+using ::testing::AllOf;
+using ::testing::ElementsAre;
+using ::testing::HasSubstr;
+using ::testing::StartsWith;
+
+namespace clang {
+namespace clangd {
+namespace {
+
+TWEAK_TEST(PopulateSwitch);
+
+TEST_F(PopulateSwitchTest, Test) {
+  struct Case {
+    CodeContext Context;
+    llvm::StringRef TestSource;
+    llvm::StringRef ExpectedSource;
+  };
+
+  Case Cases[]{
+      {
+          // No enumerators
+          Function,
+          R""(enum Enum {}; ^switch ((Enum)0) {})"",
+          "unavailable",
+      },
+      {
+          // All enumerators already in switch (unscoped)
+          Function,
+          R""(enum Enum {A,B}; ^switch (A) {case A:break;case B:break;})"",
+          "unavailable",
+      },
+      {
+          // All enumerators already in switch (scoped)
+          Function,
+          R""(
+            enum class Enum {A,B};
+            ^switch (Enum::A) {case Enum::A:break;case Enum::B:break;}
+          )"",
+          "unavailable",
+      },
+      {
+          // Default case in switch
+          Function,
+          R""(
+            enum class Enum {A,B};
+            ^switch (Enum::A) {default:break;}
+          )"",
+          "unavailable",
+      },
+      {
+          // GNU range in switch
+          Function,
+          R""(
+            enum class Enum {A,B};
+            ^switch (Enum::A) {case Enum::A ... Enum::B:break;}
+          )"",
+          "unavailable",
+      },
+      {
+          // Value dependent case expression
+          File,
+          R""(
+            enum class Enum {A,B};
+            template<Enum Value>
+            void function() {
+                ^switch (Enum::A) {case Value:break;}
+            }
+          )"",
+          "unavailable",
+      },
+      {
+          // Body not CompoundStmt
+          Function,
+          R""(enum Enum {A}; ^switch (A);)"",
+          "unavailable",
+      },
+      {
+          // Selection on switch token
+          Function,
+          R""(enum Enum {A}; ^switch (A) {})"",
+          R""(enum Enum {A}; switch (A) {case A:break;})"",
+      },
+      {
+          // Selection on switch condition
+          Function,
+          R""(enum Enum {A}; switch (^A) {})"",
+          R""(enum Enum {A}; switch (A) {case A:break;})"",
+      },
+      {
+          // Selection in switch body
+          Function,
+          R""(enum Enum {A}; switch (A) {^})"",
+          R""(enum Enum {A}; switch (A) {case A:break;})"",
+      },
+      {
+          // Scoped enumeration
+          Function,
+          R""(enum class Enum {A}; ^switch (Enum::A) {})"",
+          R""(enum class Enum {A}; switch (Enum::A) {case Enum::A:break;})"",
+      },
+      {
+          // Scoped enumeration with multiple enumerators
+          Function,
+          R""(
+            enum class Enum {A,B};
+            ^switch (Enum::A) {}
+          )"",
+          R""(
+            enum class Enum {A,B};
+            switch (Enum::A) {case Enum::A:case Enum::B:break;}
+          )"",
+      },
+      {
+          // Only filling in missing enumerators (unscoped)
+          Function,
+          R""(
+            enum Enum {A,B,C};
+            ^switch (A) {case B:break;}
+          )"",
+          R""(
+            enum Enum {A,B,C};
+            switch (A) {case B:break;case A:case C:break;}
+          )"",
+      },
+      {
+          // Only filling in missing enumerators,
+          // even when using integer literals
+          Function,
+          R""(
+            enum Enum {A,B=1,C};
+            ^switch (A) {case 1:break;}
+          )"",
+          R""(
+            enum Enum {A,B=1,C};
+            switch (A) {case 1:break;case A:case C:break;}
+          )"",
+      },
+      {
+          // Only filling in missing enumerators (scoped)
+          Function,
+          R""(
+            enum class Enum {A,B,C};
+            ^switch (Enum::A)
+            {case Enum::B:break;}
+          )"",
+          R""(
+            enum class Enum {A,B,C};
+            switch (Enum::A)
+            {case Enum::B:break;case Enum::A:case Enum::C:break;}
+          )"",
+      },
+      {
+          // Scoped enumerations in namespace
+          File,
+          R""(
+            namespace ns { enum class Enum {A}; }
+            void function() { ^switch (ns::Enum::A) {} }
+          )"",
+          R""(
+            namespace ns { enum class Enum {A}; }
+            void function() { switch (ns::Enum::A) {case ns::Enum::A:break;} }
+          )"",
+      },
+      {
+          // Unscoped enumerations in namespace
+          File,
+          R""(
+            namespace ns { enum Enum {A}; }
+            void function() { ^switch (ns::A) {} }
+          )"",
+          R""(
+            namespace ns { enum Enum {A}; }
+            void function() { switch (ns::A) {case ns::A:break;} }
+          )"",
+      },
+      {
+          // Duplicated constant names
+          Function,
+          R""(enum Enum {A,B,b=B}; ^switch (A) {})"",
+          R""(enum Enum {A,B,b=B}; switch (A) {case A:case B:break;})"",
+      },
+      {
+          // Duplicated constant names all in switch
+          Function,
+          R""(enum Enum {A,B,b=B}; ^switch (A) {case A:case B:break;})"",
+          "unavailable",
+      },
+      {
+          // Enum is dependent type
+          File,
+          R""(template<typename T> void f() {enum Enum {A}; ^switch (A) {}})"",
+          "unavailable",
+      },
+  };
+
+  for (const auto &Case : Cases) {
+    Context = Case.Context;
+    EXPECT_EQ(apply(Case.TestSource), Case.ExpectedSource);
+  }
+}
+
+} // namespace
+} // namespace clangd
+} // namespace clang

clang-tools-extra/clangd/unittests/tweaks/RawStringLiteralTests.cpp

+//===-- RawStringLiteralTests.cpp -------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "Annotations.h"
+#include "Config.h"
+#include "SourceCode.h"
+#include "TestFS.h"
+#include "TestTU.h"
+#include "TweakTesting.h"
+#include "refactor/Tweak.h"
+#include "clang/AST/Expr.h"
+#include "clang/Basic/Diagnostic.h"
+#include "clang/Basic/DiagnosticIDs.h"
+#include "clang/Basic/DiagnosticOptions.h"
+#include "clang/Basic/FileManager.h"
+#include "clang/Basic/FileSystemOptions.h"
+#include "clang/Basic/LLVM.h"
+#include "clang/Basic/SourceLocation.h"
+#include "clang/Basic/SourceManager.h"
+#include "clang/Rewrite/Core/Rewriter.h"
+#include "clang/Tooling/Core/Replacement.h"
+#include "llvm/ADT/IntrusiveRefCntPtr.h"
+#include "llvm/ADT/StringExtras.h"
+#include "llvm/ADT/StringMap.h"
+#include "llvm/ADT/StringRef.h"
+#include "llvm/Support/Error.h"
+#include "llvm/Support/MemoryBuffer.h"
+#include "llvm/Support/VirtualFileSystem.h"
+#include "llvm/Testing/Support/Error.h"
+#include "gmock/gmock-matchers.h"
+#include "gmock/gmock.h"
+#include "gtest/gtest.h"
+#include <cassert>
+#include <string>
+#include <utility>
+#include <vector>
+
+namespace clang {
+namespace clangd {
+namespace {
+
+TWEAK_TEST(RawStringLiteral);
+
+TEST_F(RawStringLiteralTest, Test) {
+  Context = Expression;
+  EXPECT_AVAILABLE(R"cpp(^"^f^o^o^\^n^")cpp");
+  EXPECT_AVAILABLE(R"cpp(R"(multi )" ^"token " "str\ning")cpp");
+  EXPECT_UNAVAILABLE(R"cpp(^"f^o^o^o")cpp"); // no chars need escaping
+  EXPECT_UNAVAILABLE(R"cpp(R"(multi )" ^"token " u8"str\ning")cpp"); // nonascii
+  EXPECT_UNAVAILABLE(R"cpp(^R^"^(^multi )" "token " "str\ning")cpp"); // raw
+  EXPECT_UNAVAILABLE(R"cpp(^"token\n" __FILE__)cpp"); // chunk is macro
+  EXPECT_UNAVAILABLE(R"cpp(^"a\r\n";)cpp");           // forbidden escape char
+
+  const char *Input = R"cpp(R"(multi
+token)" "\nst^ring\n" "literal")cpp";
+  const char *Output = R"cpp(R"(multi
+token
+string
+literal)")cpp";
+  EXPECT_EQ(apply(Input), Output);
+}
+
+} // namespace
+} // namespace clangd
+} // namespace clang

clang-tools-extra/clangd/unittests/tweaks/RemoveUsingNamespaceTests.cpp

+//===-- RemoveUsingNamespaceTest.cpp ----------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "Annotations.h"
+#include "Config.h"
+#include "SourceCode.h"
+#include "TestFS.h"
+#include "TestTU.h"
+#include "TweakTesting.h"
+#include "refactor/Tweak.h"
+#include "clang/AST/Expr.h"
+#include "clang/Basic/Diagnostic.h"
+#include "clang/Basic/DiagnosticIDs.h"
+#include "clang/Basic/DiagnosticOptions.h"
+#include "clang/Basic/FileManager.h"
+#include "clang/Basic/FileSystemOptions.h"
+#include "clang/Basic/LLVM.h"
+#include "clang/Basic/SourceLocation.h"
+#include "clang/Basic/SourceManager.h"
+#include "clang/Rewrite/Core/Rewriter.h"
+#include "clang/Tooling/Core/Replacement.h"
+#include "llvm/ADT/IntrusiveRefCntPtr.h"
+#include "llvm/ADT/StringExtras.h"
+#include "llvm/ADT/StringMap.h"
+#include "llvm/ADT/StringRef.h"
+#include "llvm/Support/Error.h"
+#include "llvm/Support/MemoryBuffer.h"
+#include "llvm/Support/VirtualFileSystem.h"
+#include "llvm/Testing/Support/Error.h"
+#include "gmock/gmock-matchers.h"
+#include "gmock/gmock.h"
+#include "gtest/gtest.h"
+#include <cassert>
+#include <string>
+#include <utility>
+#include <vector>
+
+namespace clang {
+namespace clangd {
+namespace {
+
+TWEAK_TEST(RemoveUsingNamespace);
+
+TEST_F(RemoveUsingNamespaceTest, All) {
+  std::pair<llvm::StringRef /*Input*/, llvm::StringRef /*Expected*/> Cases[] = {
+      {// Remove all occurrences of ns. Qualify only unqualified.
+       R"cpp(
+      namespace ns1 { struct vector {}; }
+      namespace ns2 { struct map {}; }
+      using namespace n^s1;
+      using namespace ns2;
+      using namespace ns1;
+      int main() {
+        ns1::vector v1;
+        vector v2;
+        map m1;
+      }
+    )cpp",
+       R"cpp(
+      namespace ns1 { struct vector {}; }
+      namespace ns2 { struct map {}; }
+      
+      using namespace ns2;
+      
+      int main() {
+        ns1::vector v1;
+        ns1::vector v2;
+        map m1;
+      }
+    )cpp"},
+      {// Ident to be qualified is a macro arg.
+       R"cpp(
+      #define DECLARE(x, y) x y
+      namespace ns { struct vector {}; }
+      using namespace n^s;
+      int main() {
+        DECLARE(ns::vector, v1);
+        DECLARE(vector, v2);
+      }
+    )cpp",
+       R"cpp(
+      #define DECLARE(x, y) x y
+      namespace ns { struct vector {}; }
+      
+      int main() {
+        DECLARE(ns::vector, v1);
+        DECLARE(ns::vector, v2);
+      }
+    )cpp"},
+      {// Nested namespace: Fully qualify ident from inner ns.
+       R"cpp(
+      namespace aa { namespace bb { struct map {}; }}
+      using namespace aa::b^b;
+      int main() {
+        map m;
+      }
+    )cpp",
+       R"cpp(
+      namespace aa { namespace bb { struct map {}; }}
+      
+      int main() {
+        aa::bb::map m;
+      }
+    )cpp"},
+      {// Nested namespace: Fully qualify ident from inner ns.
+       R"cpp(
+      namespace aa { namespace bb { struct map {}; }}
+      using namespace a^a;
+      int main() {
+        bb::map m;
+      }
+    )cpp",
+       R"cpp(
+      namespace aa { namespace bb { struct map {}; }}
+      
+      int main() {
+        aa::bb::map m;
+      }
+    )cpp"},
+      {// Typedef.
+       R"cpp(
+      namespace aa { namespace bb { struct map {}; }}
+      using namespace a^a;
+      typedef bb::map map;
+      int main() { map M; }
+    )cpp",
+       R"cpp(
+      namespace aa { namespace bb { struct map {}; }}
+      
+      typedef aa::bb::map map;
+      int main() { map M; }
+    )cpp"},
+      {// FIXME: Nested namespaces: Not aware of using ns decl of outer ns.
+       R"cpp(
+      namespace aa { namespace bb { struct map {}; }}
+      using name[[space aa::b]]b;
+      using namespace aa;
+      int main() {
+        map m;
+      }
+    )cpp",
+       R"cpp(
+      namespace aa { namespace bb { struct map {}; }}
+      
+      using namespace aa;
+      int main() {
+        aa::bb::map m;
+      }
+    )cpp"},
+      {// Does not qualify ident from inner namespace.
+       R"cpp(
+      namespace aa { namespace bb { struct map {}; }}
+      using namespace aa::bb;
+      using namespace a^a;
+      int main() {
+        map m;
+      }
+    )cpp",
+       R"cpp(
+      namespace aa { namespace bb { struct map {}; }}
+      using namespace aa::bb;
+      
+      int main() {
+        map m;
+      }
+    )cpp"},
+      {// Available only for top level namespace decl.
+       R"cpp(
+        namespace aa {
+          namespace bb { struct map {}; }
+          using namespace b^b;
+        }
+        int main() { aa::map m; }
+    )cpp",
+       "unavailable"},
+      {// FIXME: Unavailable for namespaces containing using-namespace decl.
+       R"cpp(
+      namespace aa {
+        namespace bb { struct map {}; }
+        using namespace bb;
+      }
+      using namespace a^a;
+      int main() {
+        map m;
+      }
+    )cpp",
+       "unavailable"},
+      {R"cpp(
+      namespace a::b { struct Foo {}; }
+      using namespace a;
+      using namespace a::[[b]];
+      using namespace b;
+      int main() { Foo F;}
+    )cpp",
+       R"cpp(
+      namespace a::b { struct Foo {}; }
+      using namespace a;
+      
+      
+      int main() { a::b::Foo F;}
+    )cpp"},
+      {R"cpp(
+      namespace a::b { struct Foo {}; }
+      using namespace a;
+      using namespace a::b;
+      using namespace [[b]];
+      int main() { Foo F;}
+    )cpp",
+       R"cpp(
+      namespace a::b { struct Foo {}; }
+      using namespace a;
+      
+      
+      int main() { b::Foo F;}
+    )cpp"},
+      {// Enumerators.
+       R"cpp(
+      namespace tokens {
+      enum Token {
+        comma, identifier, numeric
+      };
+      }
+      using namespace tok^ens;
+      int main() {
+        auto x = comma;
+      }
+    )cpp",
+       R"cpp(
+      namespace tokens {
+      enum Token {
+        comma, identifier, numeric
+      };
+      }
+      
+      int main() {
+        auto x = tokens::comma;
+      }
+    )cpp"},
+      {// inline namespaces.
+       R"cpp(
+      namespace std { inline namespace ns1 { inline namespace ns2 { struct vector {}; }}}
+      using namespace st^d;
+      int main() {
+        vector V;
+      }
+    )cpp",
+       R"cpp(
+      namespace std { inline namespace ns1 { inline namespace ns2 { struct vector {}; }}}
+      
+      int main() {
+        std::vector V;
+      }
+    )cpp"}};
+  for (auto C : Cases)
+    EXPECT_EQ(C.second, apply(C.first)) << C.first;
+}
+
+} // namespace
+} // namespace clangd
+} // namespace clang

clang-tools-extra/clangd/unittests/tweaks/ShowSelectionTreeTests.cpp

+//===-- ShowSelectionTreeTests.cpp ------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "Annotations.h"
+#include "Config.h"
+#include "SourceCode.h"
+#include "TestFS.h"
+#include "TestTU.h"
+#include "TweakTesting.h"
+#include "refactor/Tweak.h"
+#include "clang/AST/Expr.h"
+#include "clang/Basic/Diagnostic.h"
+#include "clang/Basic/DiagnosticIDs.h"
+#include "clang/Basic/DiagnosticOptions.h"
+#include "clang/Basic/FileManager.h"
+#include "clang/Basic/FileSystemOptions.h"
+#include "clang/Basic/LLVM.h"
+#include "clang/Basic/SourceLocation.h"
+#include "clang/Basic/SourceManager.h"
+#include "clang/Rewrite/Core/Rewriter.h"
+#include "clang/Tooling/Core/Replacement.h"
+#include "llvm/ADT/IntrusiveRefCntPtr.h"
+#include "llvm/ADT/StringExtras.h"
+#include "llvm/ADT/StringMap.h"
+#include "llvm/ADT/StringRef.h"
+#include "llvm/Support/Error.h"
+#include "llvm/Support/MemoryBuffer.h"
+#include "llvm/Support/VirtualFileSystem.h"
+#include "llvm/Testing/Support/Error.h"
+#include "gmock/gmock-matchers.h"
+#include "gmock/gmock.h"
+#include "gtest/gtest.h"
+#include <cassert>
+#include <string>
+#include <utility>
+#include <vector>
+
+namespace clang {
+namespace clangd {
+namespace {
+
+TWEAK_TEST(ShowSelectionTree);
+
+TEST_F(ShowSelectionTreeTest, Test) {
+  EXPECT_AVAILABLE("^int f^oo() { re^turn 2 ^+ 2; }");
+  EXPECT_AVAILABLE("/*c^omment*/ int foo() { return 2 ^ + 2; }");
+
+  const char *Output = R"(message:
+ TranslationUnitDecl 
+   VarDecl int x = fcall(2 + 2)
+    .CallExpr fcall(2 + 2)
+       ImplicitCastExpr fcall
+        .DeclRefExpr fcall
+      .BinaryOperator 2 + 2
+        *IntegerLiteral 2
+)";
+  EXPECT_EQ(apply("int fcall(int); int x = fca[[ll(2 +]]2);"), Output);
+
+  Output = R"(message:
+ TranslationUnitDecl 
+   FunctionDecl void x()
+     CompoundStmt { …
+       ForStmt for (;;) …
+        *BreakStmt break;
+)";
+  EXPECT_EQ(apply("void x() { for (;;) br^eak; }"), Output);
+}
+
+} // namespace
+} // namespace clangd
+} // namespace clang

clang-tools-extra/clangd/unittests/tweaks/SwapIfBranchesTests.cpp

+//===-- SwapIfBranchesTests.cpp ---------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "Annotations.h"
+#include "Config.h"
+#include "SourceCode.h"
+#include "TestFS.h"
+#include "TestTU.h"
+#include "TweakTesting.h"
+#include "refactor/Tweak.h"
+#include "clang/AST/Expr.h"
+#include "clang/Basic/Diagnostic.h"
+#include "clang/Basic/DiagnosticIDs.h"
+#include "clang/Basic/DiagnosticOptions.h"
+#include "clang/Basic/FileManager.h"
+#include "clang/Basic/FileSystemOptions.h"
+#include "clang/Basic/LLVM.h"
+#include "clang/Basic/SourceLocation.h"
+#include "clang/Basic/SourceManager.h"
+#include "clang/Rewrite/Core/Rewriter.h"
+#include "clang/Tooling/Core/Replacement.h"
+#include "llvm/ADT/IntrusiveRefCntPtr.h"
+#include "llvm/ADT/StringExtras.h"
+#include "llvm/ADT/StringMap.h"
+#include "llvm/ADT/StringRef.h"
+#include "llvm/Support/Error.h"
+#include "llvm/Support/MemoryBuffer.h"
+#include "llvm/Support/VirtualFileSystem.h"
+#include "llvm/Testing/Support/Error.h"
+#include "gmock/gmock-matchers.h"
+#include "gmock/gmock.h"
+#include "gtest/gtest.h"
+#include <cassert>
+#include <string>
+#include <utility>
+#include <vector>
+
+namespace clang {
+namespace clangd {
+namespace {
+
+TWEAK_TEST(SwapIfBranches);
+
+TEST_F(SwapIfBranchesTest, Test) {
+  Context = Function;
+  EXPECT_EQ(apply("^if (true) {return;} else {(void)0;}"),
+            "if (true) {(void)0;} else {return;}");
+  EXPECT_EQ(apply("^if (/*error-ok*/) {return;} else {(void)0;}"),
+            "if (/*error-ok*/) {(void)0;} else {return;}")
+      << "broken condition";
+  EXPECT_AVAILABLE("^i^f^^(^t^r^u^e^) { return; } ^e^l^s^e^ { return; }");
+  EXPECT_UNAVAILABLE("if (true) {^return ^;^ } else { ^return^;^ }");
+  // Available in subexpressions of the condition;
+  EXPECT_THAT("if(2 + [[2]] + 2) { return; } else {return;}", isAvailable());
+  // But not as part of the branches.
+  EXPECT_THAT("if(2 + 2 + 2) { [[return]]; } else { return; }",
+              Not(isAvailable()));
+  // Range covers the "else" token, so available.
+  EXPECT_THAT("if(2 + 2 + 2) { return[[; } else {return;]]}", isAvailable());
+  // Not available in compound statements in condition.
+  EXPECT_THAT("if([]{return [[true]];}()) { return; } else { return; }",
+              Not(isAvailable()));
+  // Not available if both sides aren't braced.
+  EXPECT_THAT("^if (1) return; else { return; }", Not(isAvailable()));
+  // Only one if statement is supported!
+  EXPECT_THAT("[[if(1){}else{}if(2){}else{}]]", Not(isAvailable()));
+}
+
+} // namespace
+} // namespace clangd
+} // namespace clang

clang-tools-extra/clangd/unittests/tweaks/TweakTesting.h

protected:
   // Primarily used from EXPECT_AVAILABLE/EXPECT_UNAVAILABLE macro.
   static std::vector<std::string> expandCases(llvm::StringRef MarkedCode);
 
   // Returns a matcher that accepts marked code snippets where the tweak is
   // available at the marked range.
   ::testing::Matcher<llvm::StringRef> isAvailable() const;
 };
 
+MATCHER_P2(FileWithContents, FileName, Contents, "") {
+  return arg.first() == FileName && arg.second == Contents;
+}
+
 #define TWEAK_TEST(TweakID)                                                    \
   class TweakID##Test : public ::clang::clangd::TweakTest {                    \
   protected:                                                                   \
     TweakID##Test() : TweakTest(#TweakID) {}                                   \
   }
 
 #define EXPECT_AVAILABLE(MarkedCode)                                           \
   do {                                                                         \

clang-tools-extra/clangd/unittests/tweaks/TweakTesting.cpp

 
 namespace clang {
 namespace clangd {
 namespace {
 using Context = TweakTest::CodeContext;
 
 std::pair<llvm::StringRef, llvm::StringRef> wrapping(Context Ctx) {
   switch (Ctx) {
-    case TweakTest::File:
-      return {"",""};
-    case TweakTest::Function:
-      return {"void wrapperFunction(){\n", "\n}"};
-    case TweakTest::Expression:
-      return {"auto expressionWrapper(){return\n", "\n;}"};
+    return {"", ""};
   }
   llvm_unreachable("Unknown TweakTest::CodeContext enum");
 }
 
 std::string wrap(Context Ctx, llvm::StringRef Inner) {
   auto Wrapping = wrapping(Ctx);
   return (Wrapping.first + Inner + Wrapping.second).str();
 }
 
 llvm::StringRef unwrap(Context Ctx, llvm::StringRef Outer) {
   auto Wrapping = wrapping(Ctx);
   // Unwrap only if the code matches the expected wrapping.
   // Don't allow the begin/end wrapping to overlap!
   if (Outer.startswith(Wrapping.first) && Outer.endswith(Wrapping.second) &&
       Outer.size() >= Wrapping.first.size() + Wrapping.second.size())
-    return Outer.drop_front(Wrapping.first.size()).drop_back(Wrapping.second.size());
+    return Outer.drop_front(Wrapping.first.size())
+        .drop_back(Wrapping.second.size());
   return Outer;
 }
 
 std::pair<unsigned, unsigned> rangeOrPoint(const Annotations &A) {
   Range SelectionRng;
   if (A.points().size() != 0) {
     assert(A.ranges().size() == 0 &&
            "both a cursor point and a selection range were specified");
::testing::Matcher<llvm::StringRef> TweakTest::isAvailable() const {
   return TweakIsAvailable(llvm::StringRef(TweakID), Context, Header, ExtraArgs,
                           ExtraFiles, Index.get(), FileName);
 }
 
 std::vector<std::string> TweakTest::expandCases(llvm::StringRef MarkedCode) {
   Annotations Test(MarkedCode);
   llvm::StringRef Code = Test.code();
   std::vector<std::string> Cases;
-  for (const auto& Point : Test.points()) {
+  for (const auto &Point : Test.points()) {
     size_t Offset = llvm::cantFail(positionToOffset(Code, Point));
     Cases.push_back((Code.substr(0, Offset) + "^" + Code.substr(Offset)).str());
   }
-  for (const auto& Range : Test.ranges()) {
+  for (const auto &Range : Test.ranges()) {
     size_t Begin = llvm::cantFail(positionToOffset(Code, Range.start));
     size_t End = llvm::cantFail(positionToOffset(Code, Range.end));
     Cases.push_back((Code.substr(0, Begin) + "[[" +
                      Code.substr(Begin, End - Begin) + "]]" + Code.substr(End))
                         .str());
   }
   assert(!Cases.empty() && "No markings in MarkedCode?");
   return Cases;
 }
 
 } // namespace clangd
 } // namespace clang

clang-tools-extra/clangd/unittests/tweaks/TweakTests.cpp

+//===-- TweakTests.cpp ------------------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "Annotations.h"
+#include "Config.h"
+#include "SourceCode.h"
+#include "TestFS.h"
+#include "TestTU.h"
+#include "TweakTesting.h"
+#include "refactor/Tweak.h"
+#include "clang/AST/Expr.h"
+#include "clang/Basic/Diagnostic.h"
+#include "clang/Basic/DiagnosticIDs.h"
+#include "clang/Basic/DiagnosticOptions.h"
+#include "clang/Basic/FileManager.h"
+#include "clang/Basic/FileSystemOptions.h"
+#include "clang/Basic/LLVM.h"
+#include "clang/Basic/SourceLocation.h"
+#include "clang/Basic/SourceManager.h"
+#include "clang/Rewrite/Core/Rewriter.h"
+#include "clang/Tooling/Core/Replacement.h"
+#include "llvm/ADT/IntrusiveRefCntPtr.h"
+#include "llvm/ADT/StringExtras.h"
+#include "llvm/ADT/StringMap.h"
+#include "llvm/ADT/StringRef.h"
+#include "llvm/Support/Error.h"
+#include "llvm/Support/MemoryBuffer.h"
+#include "llvm/Support/VirtualFileSystem.h"
+#include "llvm/Testing/Support/Error.h"
+#include "gmock/gmock-matchers.h"
+#include "gmock/gmock.h"
+#include "gtest/gtest.h"
+#include <cassert>
+#include <string>
+#include <utility>
+#include <vector>
+
+namespace clang {
+namespace clangd {
+namespace {
+
+TEST(FileEdits, AbsolutePath) {
+  auto RelPaths = {"a.h", "foo.cpp", "test/test.cpp"};
+
+  llvm::IntrusiveRefCntPtr<llvm::vfs::InMemoryFileSystem> MemFS(
+      new llvm::vfs::InMemoryFileSystem);
+  MemFS->setCurrentWorkingDirectory(testRoot());
+  for (const auto *Path : RelPaths)
+    MemFS->addFile(Path, 0, llvm::MemoryBuffer::getMemBuffer("", Path));
+  FileManager FM(FileSystemOptions(), MemFS);
+  DiagnosticsEngine DE(new DiagnosticIDs, new DiagnosticOptions);
+  SourceManager SM(DE, FM);
+
+  for (const auto *Path : RelPaths) {
+    auto FID = SM.createFileID(*FM.getFile(Path), SourceLocation(),
+                               clang::SrcMgr::C_User);
+    auto Res = Tweak::Effect::fileEdit(SM, FID, tooling::Replacements());
+    ASSERT_THAT_EXPECTED(Res, llvm::Succeeded());
+    EXPECT_EQ(Res->first, testPath(Path));
+  }
+}
+
+} // namespace
+} // namespace clangd
+} // namespace clang