1 files changed, 18 insertions, 0 deletions
diff --git a/clang/unittests/Tooling/ToolingTest.cpp b/clang/unittests/Tooling/ToolingTest.cpp
index 891907a4d08..6dd0e53c4dd 100644
--- a/clang/unittests/Tooling/ToolingTest.cpp
+++ b/clang/unittests/Tooling/ToolingTest.cpp
@@ -402,6 +402,24 @@ TEST(ClangToolTest, ArgumentAdjusters) {
   EXPECT_FALSE(Found);
 }
 
+TEST(ClangToolTest, BaseVirtualFileSystemUsage) {
+  FixedCompilationDatabase Compilations("/", std::vector<std::string>());
+  llvm::IntrusiveRefCntPtr<vfs::OverlayFileSystem> OverlayFileSystem(
+      new vfs::OverlayFileSystem(vfs::getRealFileSystem()));
+  llvm::IntrusiveRefCntPtr<vfs::InMemoryFileSystem> InMemoryFileSystem(
+      new vfs::InMemoryFileSystem);
+  OverlayFileSystem->pushOverlay(InMemoryFileSystem);
+
+  InMemoryFileSystem->addFile(
+      "a.cpp", 0, llvm::MemoryBuffer::getMemBuffer("int main() {}"));
+
+  ClangTool Tool(Compilations, std::vector<std::string>(1, "a.cpp"),
+                 std::make_shared<PCHContainerOperations>(), OverlayFileSystem);
+  std::unique_ptr<FrontendActionFactory> Action(
+      newFrontendActionFactory<SyntaxOnlyAction>());
+  EXPECT_EQ(0, Tool.run(Action.get()));
+}
+
 // Check getClangStripDependencyFileAdjuster doesn't strip args after -MD/-MMD.
 TEST(ClangToolTest, StripDependencyFileAdjuster) {
   FixedCompilationDatabase Compilations("/", {"-MD", "-c", "-MMD", "-w"});