diff --git a/clang-tools-extra/clangd/unittests/FindTargetTests.cpp b/clang-tools-extra/clangd/unittests/FindTargetTests.cpp
--- a/clang-tools-extra/clangd/unittests/FindTargetTests.cpp
+++ b/clang-tools-extra/clangd/unittests/FindTargetTests.cpp
@@ -566,6 +566,9 @@
     TU.ExtraArgs.push_back("-std=c++17");
 
     auto AST = TU.build();
+    for (auto &D : AST.getDiagnostics())
+      ADD_FAILURE() << D << Code;
+    assert(AST.getDiagnostics().empty());
 
     auto *TestDecl = &findDecl(AST, "foo");
     if (auto *T = llvm::dyn_cast<FunctionTemplateDecl>(TestDecl))
@@ -663,7 +666,7 @@
          void foo() {
            $0^Struct $1^x;
            $2^Typedef $3^y;
-           static_cast<$4^Struct*>(0);
+           (void)static_cast<$4^Struct*>(0);
          }
        )cpp",
         "0: targets = {Struct}\n"
@@ -718,7 +721,7 @@
         "3: targets = {vb}, decl\n"},
        // MemberExpr should know their using declaration.
        {R"cpp(
-            struct X { void func(int); }
+            struct X { void func(int); };
             struct Y : X {
               using X::func;
             };
@@ -744,7 +747,7 @@
             #define BAR b
 
             void foo(int a, int b) {
-              $0^FOO+$1^BAR;
+              (void)($0^FOO+$1^BAR);
             }
         )cpp",
         "0: targets = {a}\n"
@@ -824,7 +827,7 @@
             void foo() {
               $0^TT<int> $1^x;
               $2^foo<$3^TT>();
-              $4^foo<$5^vector>()
+              $4^foo<$5^vector>();
               $6^foo<$7^TP...>();
             }
         )cpp",
@@ -891,7 +894,7 @@
                };
                // delegating initializer
                class $10^Foo {
-                 $11^Foo(int);
+                 $11^Foo(int) {}
                  $12^Foo(): $13^Foo(111) {}
                };
              }
@@ -924,7 +927,7 @@
        // Namespace aliases should be handled properly.
        {
            R"cpp(
-                namespace ns { struct Type {} }
+                namespace ns { struct Type {}; }
                 namespace alias = ns;
                 namespace rec_alias = alias;