diff --git a/clang/include/clang/Tooling/Syntax/BuildTree.h b/clang/include/clang/Tooling/Syntax/BuildTree.h
--- a/clang/include/clang/Tooling/Syntax/BuildTree.h
+++ b/clang/include/clang/Tooling/Syntax/BuildTree.h
@@ -24,8 +24,13 @@
 
 // Create syntax trees from subtrees not backed by the source code.
 
-clang::syntax::Leaf *createPunctuation(clang::syntax::Arena &A,
-                                       clang::tok::TokenKind K);
+// Synthesis of Leafs
+syntax::Leaf *createPunctuation(Arena &A, tok::TokenKind K);
+syntax::Leaf *createKeyword(Arena &A, tok::TokenKind K);
+syntax::Leaf *createLeaf(syntax::Arena &A, const char *spelling,
+                         tok::TokenKind K);
+
+// Synthesis of Syntax Nodes
 clang::syntax::EmptyStatement *createEmptyStatement(clang::syntax::Arena &A);
 
 } // namespace syntax
diff --git a/clang/lib/Tooling/Syntax/Synthesis.cpp b/clang/lib/Tooling/Syntax/Synthesis.cpp
--- a/clang/lib/Tooling/Syntax/Synthesis.cpp
+++ b/clang/lib/Tooling/Syntax/Synthesis.cpp
@@ -5,6 +5,7 @@
 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
+#include "clang/Basic/TokenKinds.h"
 #include "clang/Tooling/Syntax/BuildTree.h"
 
 using namespace clang;
@@ -21,24 +22,38 @@
   }
 };
 
-clang::syntax::Leaf *syntax::createPunctuation(clang::syntax::Arena &A,
-                                               clang::tok::TokenKind K) {
-  auto Tokens = A.lexBuffer(llvm::MemoryBuffer::getMemBuffer(
-                                clang::tok::getPunctuatorSpelling(K)))
-                    .second;
+namespace {
+syntax::Leaf *createLeafLowLevel(syntax::Arena &A, const char *spelling) {
+  auto Tokens = A.lexBuffer(llvm::MemoryBuffer::getMemBuffer(spelling)).second;
   assert(Tokens.size() == 1);
-  assert(Tokens.front().kind() == K);
-  auto *L = new (A.allocator()) clang::syntax::Leaf(Tokens.begin());
-  FactoryImpl::setCanModify(L);
+  auto *L = new (A.allocator()) syntax::Leaf(Tokens.begin());
+  clang::syntax::FactoryImpl::setCanModify(L);
   L->assertInvariants();
   return L;
 }
+} // namespace
 
-clang::syntax::EmptyStatement *
-syntax::createEmptyStatement(clang::syntax::Arena &A) {
-  auto *S = new (A.allocator()) clang::syntax::EmptyStatement;
+syntax::Leaf *clang::syntax::createLeaf(syntax::Arena &A, const char *spelling,
+                                        tok::TokenKind K) {
+  auto *Leaf = createLeafLowLevel(A, spelling);
+  assert(Leaf->token()->kind() == K &&
+         "spelling is not lexed into the expected kind of token");
+  return Leaf;
+}
+
+syntax::Leaf *clang::syntax::createPunctuation(syntax::Arena &A,
+                                               tok::TokenKind K) {
+  return createLeaf(A, tok::getPunctuatorSpelling(K), K);
+}
+
+syntax::Leaf *clang::syntax::createKeyword(syntax::Arena &A, tok::TokenKind K) {
+  return createLeaf(A, tok::getKeywordSpelling(K), K);
+}
+
+syntax::EmptyStatement *clang::syntax::createEmptyStatement(syntax::Arena &A) {
+  auto *S = new (A.allocator()) syntax::EmptyStatement;
   FactoryImpl::setCanModify(S);
-  FactoryImpl::prependChildLowLevel(S, createPunctuation(A, clang::tok::semi),
+  FactoryImpl::prependChildLowLevel(S, createPunctuation(A, tok::semi),
                                     NodeRole::Unknown);
   S->assertInvariants();
   return S;
diff --git a/clang/unittests/Tooling/Syntax/SynthesisTest.cpp b/clang/unittests/Tooling/Syntax/SynthesisTest.cpp
--- a/clang/unittests/Tooling/Syntax/SynthesisTest.cpp
+++ b/clang/unittests/Tooling/Syntax/SynthesisTest.cpp
@@ -18,27 +18,75 @@
 
 namespace {
 
-INSTANTIATE_TEST_CASE_P(SyntaxTreeTests, SyntaxTreeTest,
+std::string trim(std::string s) { return StringRef(s).trim().str(); }
+
+INSTANTIATE_TEST_CASE_P(SynthesisTest, SyntaxTreeTest,
                         ::testing::ValuesIn(allTestClangConfigs()), );
 
 TEST_P(SyntaxTreeTest, Leaf_Punctuation) {
   buildTree("", GetParam());
 
-  auto *C = syntax::createPunctuation(*Arena, tok::comma);
+  auto *C = createPunctuation(*Arena, tok::comma);
+  ASSERT_NE(C, nullptr);
+
+  auto Dump = trim(C->dump(Arena->sourceManager()));
+  auto Expected = trim(R"txt(
+',' Detached synthesized
+  )txt");
+
+  EXPECT_EQ(Expected, Dump);
+}
+
+TEST_P(SyntaxTreeTest, Leaf_Keyword) {
+  buildTree("", GetParam());
+
+  auto *C = createKeyword(*Arena, tok::kw_if);
+  ASSERT_NE(C, nullptr);
+  auto Dump = trim(C->dump(Arena->sourceManager()));
+  auto Expected = trim(R"txt(
+'if' Detached synthesized
+  )txt");
+
+  EXPECT_EQ(Expected, Dump);
+}
+
+TEST_P(SyntaxTreeTest, Leaf_Identifier) {
+  buildTree("", GetParam());
+
+  auto *C = createLeaf(*Arena, "a", tok::identifier);
   ASSERT_NE(C, nullptr);
-  EXPECT_EQ(C->token()->kind(), tok::comma);
-  EXPECT_TRUE(C->canModify());
-  EXPECT_FALSE(C->isOriginal());
-  EXPECT_TRUE(C->isDetached());
+  auto Dump = trim(C->dump(Arena->sourceManager()));
+  auto Expected = trim(R"txt(
+'a' Detached synthesized
+  )txt");
+
+  EXPECT_EQ(Expected, Dump);
 }
 
-TEST_P(SyntaxTreeTest, Statement_Empty) {
+TEST_P(SyntaxTreeTest, Leaf_Number) {
   buildTree("", GetParam());
 
-  auto *S = syntax::createEmptyStatement(*Arena);
+  auto *C = createLeaf(*Arena, "1", tok::numeric_constant);
+  ASSERT_NE(C, nullptr);
+  auto Dump = trim(C->dump(Arena->sourceManager()));
+  auto Expected = trim(R"txt(
+'1' Detached synthesized
+  )txt");
+
+  EXPECT_EQ(Expected, Dump);
+}
+
+TEST_P(SyntaxTreeTest, Statement_EmptyStatement) {
+  buildTree("", GetParam());
+
+  auto *S = createEmptyStatement(*Arena);
   ASSERT_NE(S, nullptr);
-  EXPECT_TRUE(S->canModify());
-  EXPECT_FALSE(S->isOriginal());
-  EXPECT_TRUE(S->isDetached());
+  auto Dump = trim(S->dump(Arena->sourceManager()));
+  auto Expected = trim(R"txt(
+EmptyStatement Detached synthesized
+`-';' synthesized
+  )txt");
+
+  EXPECT_EQ(Expected, Dump);
 }
 } // namespace