diff --git a/llvm/utils/gn/secondary/clang/lib/Testing/BUILD.gn b/llvm/utils/gn/secondary/clang/lib/Testing/BUILD.gn
index 2d050154f3e8..00cb4645a4c0 100644
--- a/llvm/utils/gn/secondary/clang/lib/Testing/BUILD.gn
+++ b/llvm/utils/gn/secondary/clang/lib/Testing/BUILD.gn
@@ -1,6 +1,14 @@
 static_library("Testing") {
   output_name = "clangTesting"
   configs += [ "//llvm/utils/gn/build:clang_code" ]
-  deps = [ "//llvm/lib/Support" ]
-  sources = [ "CommandLineArgs.cpp" ]
+  testonly = true
+  deps = [
+    "//clang/lib/Basic",
+    "//llvm/lib/Support",
+    "//llvm/utils/unittest:gtest",
+  ]
+  sources = [
+    "CommandLineArgs.cpp",
+    "TestAST.cpp",
+  ]
 }
diff --git a/llvm/utils/gn/secondary/clang/unittests/Tooling/BUILD.gn b/llvm/utils/gn/secondary/clang/unittests/Tooling/BUILD.gn
index 4269ed6d69cc..7cab8a0982b1 100644
--- a/llvm/utils/gn/secondary/clang/unittests/Tooling/BUILD.gn
+++ b/llvm/utils/gn/secondary/clang/unittests/Tooling/BUILD.gn
@@ -11,6 +11,7 @@ unittest("ToolingTests") {
     "//clang/lib/Frontend",
     "//clang/lib/Lex",
     "//clang/lib/Rewrite",
+    "//clang/lib/Testing",
     "//clang/lib/Tooling",
     "//clang/lib/Tooling/Core",
     "//clang/lib/Tooling/DependencyScanning",