unittests/clangd/FileIndexTests.cpp - toolchain/clang-tools-extra - Git at Google

 //===-- FileIndexTests.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 "AST.h"
 #include "Annotations.h"
 #include "ClangdUnit.h"
 #include "SyncAPI.h"
 #include "TestFS.h"
 #include "TestTU.h"
 #include "index/CanonicalIncludes.h"
 #include "index/FileIndex.h"
 #include "index/Index.h"
 #include "clang/Frontend/CompilerInvocation.h"
 #include "clang/Frontend/PCHContainerOperations.h"
 #include "clang/Frontend/Utils.h"
 #include "clang/Index/IndexSymbol.h"
 #include "clang/Lex/Preprocessor.h"
 #include "clang/Tooling/CompilationDatabase.h"
 #include "gmock/gmock.h"
 #include "gtest/gtest.h"

 using testing::_;
 using testing::AllOf;
 using testing::Contains;
 using testing::ElementsAre;
 using testing::IsEmpty;
 using testing::Pair;
 using testing::UnorderedElementsAre;

 MATCHER_P(RefRange, Range, "") {
   return std::make_tuple(arg.Location.Start.line(), arg.Location.Start.column(),
                          arg.Location.End.line(), arg.Location.End.column()) ==
          std::make_tuple(Range.start.line, Range.start.character,
                          Range.end.line, Range.end.character);
 }
 MATCHER_P(FileURI, F, "") { return llvm::StringRef(arg.Location.FileURI) == F; }
 MATCHER_P(DeclURI, U, "") {
   return llvm::StringRef(arg.CanonicalDeclaration.FileURI) == U;
 }
 MATCHER_P(DefURI, U, "") {
   return llvm::StringRef(arg.Definition.FileURI) == U;
 }
 MATCHER_P(QName, N, "") { return (arg.Scope + arg.Name).str() == N; }

 namespace clang {
 namespace clangd {
 namespace {
 testing::Matcher<const RefSlab &>
 RefsAre(std::vector<testing::Matcher<Ref>> Matchers) {
   return ElementsAre(testing::Pair(_, UnorderedElementsAreArray(Matchers)));
 }

 Symbol symbol(llvm::StringRef ID) {
   Symbol Sym;
   Sym.ID = SymbolID(ID);
   Sym.Name = ID;
   return Sym;
 }

 std::unique_ptr<SymbolSlab> numSlab(int Begin, int End) {
   SymbolSlab::Builder Slab;
   for (int i = Begin; i <= End; i++)
     Slab.insert(symbol(std::to_string(i)));
   return llvm::make_unique<SymbolSlab>(std::move(Slab).build());
 }

 std::unique_ptr<RefSlab> refSlab(const SymbolID &ID, const char *Path) {
   RefSlab::Builder Slab;
   Ref R;
   R.Location.FileURI = Path;
   R.Kind = RefKind::Reference;
   Slab.insert(ID, R);
   return llvm::make_unique<RefSlab>(std::move(Slab).build());
 }

 TEST(FileSymbolsTest, UpdateAndGet) {
   FileSymbols FS;
   EXPECT_THAT(runFuzzyFind(*FS.buildIndex(IndexType::Light), ""), IsEmpty());

   FS.update("f1", numSlab(1, 3), refSlab(SymbolID("1"), "f1.cc"));
   EXPECT_THAT(runFuzzyFind(*FS.buildIndex(IndexType::Light), ""),
               UnorderedElementsAre(QName("1"), QName("2"), QName("3")));
   EXPECT_THAT(getRefs(*FS.buildIndex(IndexType::Light), SymbolID("1")),
               RefsAre({FileURI("f1.cc")}));
 }

 TEST(FileSymbolsTest, Overlap) {
   FileSymbols FS;
   FS.update("f1", numSlab(1, 3), nullptr);
   FS.update("f2", numSlab(3, 5), nullptr);
   for (auto Type : {IndexType::Light, IndexType::Heavy})
     EXPECT_THAT(runFuzzyFind(*FS.buildIndex(Type), ""),
                 UnorderedElementsAre(QName("1"), QName("2"), QName("3"),
                                      QName("4"), QName("5")));
 }

 TEST(FileSymbolsTest, MergeOverlap) {
   FileSymbols FS;
   auto OneSymboSlab = [](Symbol Sym) {
     SymbolSlab::Builder S;
     S.insert(Sym);
     return llvm::make_unique<SymbolSlab>(std::move(S).build());
   };
   auto X1 = symbol("x");
   X1.CanonicalDeclaration.FileURI = "file:///x1";
   auto X2 = symbol("x");
   X2.Definition.FileURI = "file:///x2";

   FS.update("f1", OneSymboSlab(X1), nullptr);
   FS.update("f2", OneSymboSlab(X2), nullptr);
   for (auto Type : {IndexType::Light, IndexType::Heavy})
     EXPECT_THAT(
         runFuzzyFind(*FS.buildIndex(Type, DuplicateHandling::Merge), "x"),
         UnorderedElementsAre(
             AllOf(QName("x"), DeclURI("file:///x1"), DefURI("file:///x2"))));
 }

 TEST(FileSymbolsTest, SnapshotAliveAfterRemove) {
   FileSymbols FS;

   SymbolID ID("1");
   FS.update("f1", numSlab(1, 3), refSlab(ID, "f1.cc"));

   auto Symbols = FS.buildIndex(IndexType::Light);
   EXPECT_THAT(runFuzzyFind(*Symbols, ""),
               UnorderedElementsAre(QName("1"), QName("2"), QName("3")));
   EXPECT_THAT(getRefs(*Symbols, ID), RefsAre({FileURI("f1.cc")}));

   FS.update("f1", nullptr, nullptr);
   auto Empty = FS.buildIndex(IndexType::Light);
   EXPECT_THAT(runFuzzyFind(*Empty, ""), IsEmpty());
   EXPECT_THAT(getRefs(*Empty, ID), ElementsAre());

   EXPECT_THAT(runFuzzyFind(*Symbols, ""),
               UnorderedElementsAre(QName("1"), QName("2"), QName("3")));
   EXPECT_THAT(getRefs(*Symbols, ID), RefsAre({FileURI("f1.cc")}));
 }

 // Adds Basename.cpp, which includes Basename.h, which contains Code.
 void update(FileIndex &M, llvm::StringRef Basename, llvm::StringRef Code) {
   TestTU File;
   File.Filename = (Basename + ".cpp").str();
   File.HeaderFilename = (Basename + ".h").str();
   File.HeaderCode = Code;
   auto AST = File.build();
   M.updatePreamble(File.Filename, AST.getASTContext(), AST.getPreprocessorPtr(),
                    AST.getCanonicalIncludes());
 }

 TEST(FileIndexTest, CustomizedURIScheme) {
   FileIndex M;
   update(M, "f", "class string {};");

   EXPECT_THAT(runFuzzyFind(M, ""), ElementsAre(DeclURI("unittest:///f.h")));
 }

 TEST(FileIndexTest, IndexAST) {
   FileIndex M;
   update(M, "f1", "namespace ns { void f() {} class X {}; }");

   FuzzyFindRequest Req;
   Req.Query = "";
   Req.Scopes = {"ns::"};
   EXPECT_THAT(runFuzzyFind(M, Req),
               UnorderedElementsAre(QName("ns::f"), QName("ns::X")));
 }

 TEST(FileIndexTest, NoLocal) {
   FileIndex M;
   update(M, "f1", "namespace ns { void f() { int local = 0; } class X {}; }");

   EXPECT_THAT(
       runFuzzyFind(M, ""),
       UnorderedElementsAre(QName("ns"), QName("ns::f"), QName("ns::X")));
 }

 TEST(FileIndexTest, IndexMultiASTAndDeduplicate) {
   FileIndex M;
   update(M, "f1", "namespace ns { void f() {} class X {}; }");
   update(M, "f2", "namespace ns { void ff() {} class X {}; }");

   FuzzyFindRequest Req;
   Req.Scopes = {"ns::"};
   EXPECT_THAT(
       runFuzzyFind(M, Req),
       UnorderedElementsAre(QName("ns::f"), QName("ns::X"), QName("ns::ff")));
 }

 TEST(FileIndexTest, ClassMembers) {
   FileIndex M;
   update(M, "f1", "class X { static int m1; int m2; static void f(); };");

   EXPECT_THAT(runFuzzyFind(M, ""),
               UnorderedElementsAre(QName("X"), QName("X::m1"), QName("X::m2"),
                                    QName("X::f")));
 }

 TEST(FileIndexTest, IncludeCollected) {
   FileIndex M;
   update(
       M, "f",
       "// IWYU pragma: private, include <the/good/header.h>\nclass string {};");

   auto Symbols = runFuzzyFind(M, "");
   EXPECT_THAT(Symbols, ElementsAre(_));
   EXPECT_THAT(Symbols.begin()->IncludeHeaders.front().IncludeHeader,
               "<the/good/header.h>");
 }

 TEST(FileIndexTest, TemplateParamsInLabel) {
   auto Source = R"cpp(
 template <class Ty>
 class vector {
 };

 template <class Ty, class Arg>
 vector<Ty> make_vector(Arg A) {}
 )cpp";

   FileIndex M;
   update(M, "f", Source);

   auto Symbols = runFuzzyFind(M, "");
   EXPECT_THAT(Symbols,
               UnorderedElementsAre(QName("vector"), QName("make_vector")));
   auto It = Symbols.begin();
   Symbol Vector = *It++;
   Symbol MakeVector = *It++;
   if (MakeVector.Name == "vector")
     std::swap(MakeVector, Vector);

   EXPECT_EQ(Vector.Signature, "<class Ty>");
   EXPECT_EQ(Vector.CompletionSnippetSuffix, "<${1:class Ty}>");

   EXPECT_EQ(MakeVector.Signature, "<class Ty>(Arg A)");
   EXPECT_EQ(MakeVector.CompletionSnippetSuffix, "<${1:class Ty}>(${2:Arg A})");
 }

 TEST(FileIndexTest, RebuildWithPreamble) {
   auto FooCpp = testPath("foo.cpp");
   auto FooH = testPath("foo.h");
   // Preparse ParseInputs.
   ParseInputs PI;
   PI.CompileCommand.Directory = testRoot();
   PI.CompileCommand.Filename = FooCpp;
   PI.CompileCommand.CommandLine = {"clang", "-xc++", FooCpp};

   llvm::StringMap<std::string> Files;
   Files[FooCpp] = "";
   Files[FooH] = R"cpp(
     namespace ns_in_header {
       int func_in_header();
     }
   )cpp";
   PI.FS = buildTestFS(std::move(Files));

   PI.Contents = R"cpp(
     #include "foo.h"
     namespace ns_in_source {
       int func_in_source();
     }
   )cpp";

   // Rebuild the file.
   auto CI = buildCompilerInvocation(PI);

   FileIndex Index;
   bool IndexUpdated = false;
   buildPreamble(
       FooCpp, *CI, /*OldPreamble=*/nullptr, tooling::CompileCommand(), PI,
       std::make_shared<PCHContainerOperations>(), /*StoreInMemory=*/true,
       [&](ASTContext &Ctx, std::shared_ptr<Preprocessor> PP,
           const CanonicalIncludes &CanonIncludes) {
         EXPECT_FALSE(IndexUpdated) << "Expected only a single index update";
         IndexUpdated = true;
         Index.updatePreamble(FooCpp, Ctx, std::move(PP), CanonIncludes);
       });
   ASSERT_TRUE(IndexUpdated);

   // Check the index contains symbols from the preamble, but not from the main
   // file.
   FuzzyFindRequest Req;
   Req.Query = "";
   Req.Scopes = {"", "ns_in_header::"};

   EXPECT_THAT(runFuzzyFind(Index, Req),
               UnorderedElementsAre(QName("ns_in_header"),
                                    QName("ns_in_header::func_in_header")));
 }

 TEST(FileIndexTest, Refs) {
   const char *HeaderCode = "class Foo {};";
   Annotations MainCode(R"cpp(
   void f() {
     $foo[[Foo]] foo;
   }
   )cpp");

   auto Foo =
       findSymbol(TestTU::withHeaderCode(HeaderCode).headerSymbols(), "Foo");

   RefsRequest Request;
   Request.IDs = {Foo.ID};

   FileIndex Index;
   // Add test.cc
   TestTU Test;
   Test.HeaderCode = HeaderCode;
   Test.Code = MainCode.code();
   Test.Filename = "test.cc";
   auto AST = Test.build();
   Index.updateMain(Test.Filename, AST);
   // Add test2.cc
   TestTU Test2;
   Test2.HeaderCode = HeaderCode;
   Test2.Code = MainCode.code();
   Test2.Filename = "test2.cc";
   AST = Test2.build();
   Index.updateMain(Test2.Filename, AST);

   EXPECT_THAT(getRefs(Index, Foo.ID),
               RefsAre({AllOf(RefRange(MainCode.range("foo")),
                              FileURI("unittest:///test.cc")),
                        AllOf(RefRange(MainCode.range("foo")),
                              FileURI("unittest:///test2.cc"))}));
 }

 TEST(FileIndexTest, CollectMacros) {
   FileIndex M;
   update(M, "f", "#define CLANGD 1");
   EXPECT_THAT(runFuzzyFind(M, ""), Contains(QName("CLANGD")));
 }

 TEST(FileIndexTest, ReferencesInMainFileWithPreamble) {
   const std::string Header = R"cpp(
     class Foo {};
   )cpp";
   Annotations Main(R"cpp(
     #include "foo.h"
     void f() {
       [[Foo]] foo;
     }
   )cpp");
   auto MainFile = testPath("foo.cpp");
   auto HeaderFile = testPath("foo.h");
   std::vector<const char *> Cmd = {"clang", "-xc++", MainFile.c_str()};
   // Preparse ParseInputs.
   ParseInputs PI;
   PI.CompileCommand.Directory = testRoot();
   PI.CompileCommand.Filename = MainFile;
   PI.CompileCommand.CommandLine = {Cmd.begin(), Cmd.end()};
   PI.Contents = Main.code();
   PI.FS = buildTestFS({{MainFile, Main.code()}, {HeaderFile, Header}});

   // Prepare preamble.
   auto CI = buildCompilerInvocation(PI);
   auto PreambleData = buildPreamble(
       MainFile, *buildCompilerInvocation(PI), /*OldPreamble=*/nullptr,
       tooling::CompileCommand(), PI, std::make_shared<PCHContainerOperations>(),
       /*StoreInMemory=*/true,
       [&](ASTContext &Ctx, std::shared_ptr<Preprocessor> PP,
           const CanonicalIncludes &) {});
   // Build AST for main file with preamble.
   auto AST =
       ParsedAST::build(createInvocationFromCommandLine(Cmd), PreambleData,
                        llvm::MemoryBuffer::getMemBufferCopy(Main.code()),
                        std::make_shared<PCHContainerOperations>(), PI.FS,
                        /*Index=*/nullptr, ParseOptions());
   ASSERT_TRUE(AST);
   FileIndex Index;
   Index.updateMain(MainFile, *AST);

   auto Foo = findSymbol(TestTU::withHeaderCode(Header).headerSymbols(), "Foo");
   RefsRequest Request;
   Request.IDs.insert(Foo.ID);

   // Expect to see references in main file, references in headers are excluded
   // because we only index main AST.
   EXPECT_THAT(getRefs(Index, Foo.ID), RefsAre({RefRange(Main.range())}));
 }

 } // namespace
 } // namespace clangd
 } // namespace clang
	//===-- FileIndexTests.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 "AST.h"
	#include "Annotations.h"
	#include "ClangdUnit.h"
	#include "SyncAPI.h"
	#include "TestFS.h"
	#include "TestTU.h"
	#include "index/CanonicalIncludes.h"
	#include "index/FileIndex.h"
	#include "index/Index.h"
	#include "clang/Frontend/CompilerInvocation.h"
	#include "clang/Frontend/PCHContainerOperations.h"
	#include "clang/Frontend/Utils.h"
	#include "clang/Index/IndexSymbol.h"
	#include "clang/Lex/Preprocessor.h"
	#include "clang/Tooling/CompilationDatabase.h"
	#include "gmock/gmock.h"
	#include "gtest/gtest.h"

	using testing::_;
	using testing::AllOf;
	using testing::Contains;
	using testing::ElementsAre;
	using testing::IsEmpty;
	using testing::Pair;
	using testing::UnorderedElementsAre;

	MATCHER_P(RefRange, Range, "") {
	return std::make_tuple(arg.Location.Start.line(), arg.Location.Start.column(),
	arg.Location.End.line(), arg.Location.End.column()) ==
	std::make_tuple(Range.start.line, Range.start.character,
	Range.end.line, Range.end.character);
	}
	MATCHER_P(FileURI, F, "") { return llvm::StringRef(arg.Location.FileURI) == F; }
	MATCHER_P(DeclURI, U, "") {
	return llvm::StringRef(arg.CanonicalDeclaration.FileURI) == U;
	}
	MATCHER_P(DefURI, U, "") {
	return llvm::StringRef(arg.Definition.FileURI) == U;
	}
	MATCHER_P(QName, N, "") { return (arg.Scope + arg.Name).str() == N; }

	namespace clang {
	namespace clangd {
	namespace {
	testing::Matcher<const RefSlab &>
	RefsAre(std::vector<testing::Matcher<Ref>> Matchers) {
	return ElementsAre(testing::Pair(_, UnorderedElementsAreArray(Matchers)));
	}

	Symbol symbol(llvm::StringRef ID) {
	Symbol Sym;
	Sym.ID = SymbolID(ID);
	Sym.Name = ID;
	return Sym;
	}

	std::unique_ptr<SymbolSlab> numSlab(int Begin, int End) {
	SymbolSlab::Builder Slab;
	for (int i = Begin; i <= End; i++)
	Slab.insert(symbol(std::to_string(i)));
	return llvm::make_unique<SymbolSlab>(std::move(Slab).build());
	}

	std::unique_ptr<RefSlab> refSlab(const SymbolID &ID, const char *Path) {
	RefSlab::Builder Slab;
	Ref R;
	R.Location.FileURI = Path;
	R.Kind = RefKind::Reference;
	Slab.insert(ID, R);
	return llvm::make_unique<RefSlab>(std::move(Slab).build());
	}

	TEST(FileSymbolsTest, UpdateAndGet) {
	FileSymbols FS;
	EXPECT_THAT(runFuzzyFind(*FS.buildIndex(IndexType::Light), ""), IsEmpty());

	FS.update("f1", numSlab(1, 3), refSlab(SymbolID("1"), "f1.cc"));
	EXPECT_THAT(runFuzzyFind(*FS.buildIndex(IndexType::Light), ""),
	UnorderedElementsAre(QName("1"), QName("2"), QName("3")));
	EXPECT_THAT(getRefs(*FS.buildIndex(IndexType::Light), SymbolID("1")),
	RefsAre({FileURI("f1.cc")}));
	}

	TEST(FileSymbolsTest, Overlap) {
	FileSymbols FS;
	FS.update("f1", numSlab(1, 3), nullptr);
	FS.update("f2", numSlab(3, 5), nullptr);
	for (auto Type : {IndexType::Light, IndexType::Heavy})
	EXPECT_THAT(runFuzzyFind(*FS.buildIndex(Type), ""),
	UnorderedElementsAre(QName("1"), QName("2"), QName("3"),
	QName("4"), QName("5")));
	}

	TEST(FileSymbolsTest, MergeOverlap) {
	FileSymbols FS;
	auto OneSymboSlab = [](Symbol Sym) {
	SymbolSlab::Builder S;
	S.insert(Sym);
	return llvm::make_unique<SymbolSlab>(std::move(S).build());
	};
	auto X1 = symbol("x");
	X1.CanonicalDeclaration.FileURI = "file:///x1";
	auto X2 = symbol("x");
	X2.Definition.FileURI = "file:///x2";

	FS.update("f1", OneSymboSlab(X1), nullptr);
	FS.update("f2", OneSymboSlab(X2), nullptr);
	for (auto Type : {IndexType::Light, IndexType::Heavy})
	EXPECT_THAT(
	runFuzzyFind(*FS.buildIndex(Type, DuplicateHandling::Merge), "x"),
	UnorderedElementsAre(
	AllOf(QName("x"), DeclURI("file:///x1"), DefURI("file:///x2"))));
	}

	TEST(FileSymbolsTest, SnapshotAliveAfterRemove) {
	FileSymbols FS;

	SymbolID ID("1");
	FS.update("f1", numSlab(1, 3), refSlab(ID, "f1.cc"));

	auto Symbols = FS.buildIndex(IndexType::Light);
	EXPECT_THAT(runFuzzyFind(*Symbols, ""),
	UnorderedElementsAre(QName("1"), QName("2"), QName("3")));
	EXPECT_THAT(getRefs(*Symbols, ID), RefsAre({FileURI("f1.cc")}));

	FS.update("f1", nullptr, nullptr);
	auto Empty = FS.buildIndex(IndexType::Light);
	EXPECT_THAT(runFuzzyFind(*Empty, ""), IsEmpty());
	EXPECT_THAT(getRefs(*Empty, ID), ElementsAre());

	EXPECT_THAT(runFuzzyFind(*Symbols, ""),
	UnorderedElementsAre(QName("1"), QName("2"), QName("3")));
	EXPECT_THAT(getRefs(*Symbols, ID), RefsAre({FileURI("f1.cc")}));
	}

	// Adds Basename.cpp, which includes Basename.h, which contains Code.
	void update(FileIndex &M, llvm::StringRef Basename, llvm::StringRef Code) {
	TestTU File;
	File.Filename = (Basename + ".cpp").str();
	File.HeaderFilename = (Basename + ".h").str();
	File.HeaderCode = Code;
	auto AST = File.build();
	M.updatePreamble(File.Filename, AST.getASTContext(), AST.getPreprocessorPtr(),
	AST.getCanonicalIncludes());
	}

	TEST(FileIndexTest, CustomizedURIScheme) {
	FileIndex M;
	update(M, "f", "class string {};");

	EXPECT_THAT(runFuzzyFind(M, ""), ElementsAre(DeclURI("unittest:///f.h")));
	}

	TEST(FileIndexTest, IndexAST) {
	FileIndex M;
	update(M, "f1", "namespace ns { void f() {} class X {}; }");

	FuzzyFindRequest Req;
	Req.Query = "";
	Req.Scopes = {"ns::"};
	EXPECT_THAT(runFuzzyFind(M, Req),
	UnorderedElementsAre(QName("ns::f"), QName("ns::X")));
	}

	TEST(FileIndexTest, NoLocal) {
	FileIndex M;
	update(M, "f1", "namespace ns { void f() { int local = 0; } class X {}; }");

	EXPECT_THAT(
	runFuzzyFind(M, ""),
	UnorderedElementsAre(QName("ns"), QName("ns::f"), QName("ns::X")));
	}

	TEST(FileIndexTest, IndexMultiASTAndDeduplicate) {
	FileIndex M;
	update(M, "f1", "namespace ns { void f() {} class X {}; }");
	update(M, "f2", "namespace ns { void ff() {} class X {}; }");

	FuzzyFindRequest Req;
	Req.Scopes = {"ns::"};
	EXPECT_THAT(
	runFuzzyFind(M, Req),
	UnorderedElementsAre(QName("ns::f"), QName("ns::X"), QName("ns::ff")));
	}

	TEST(FileIndexTest, ClassMembers) {
	FileIndex M;
	update(M, "f1", "class X { static int m1; int m2; static void f(); };");

	EXPECT_THAT(runFuzzyFind(M, ""),
	UnorderedElementsAre(QName("X"), QName("X::m1"), QName("X::m2"),
	QName("X::f")));
	}

	TEST(FileIndexTest, IncludeCollected) {
	FileIndex M;
	update(
	M, "f",
	"// IWYU pragma: private, include <the/good/header.h>\nclass string {};");

	auto Symbols = runFuzzyFind(M, "");
	EXPECT_THAT(Symbols, ElementsAre(_));
	EXPECT_THAT(Symbols.begin()->IncludeHeaders.front().IncludeHeader,
	"<the/good/header.h>");
	}

	TEST(FileIndexTest, TemplateParamsInLabel) {
	auto Source = R"cpp(
	template <class Ty>
	class vector {
	};

	template <class Ty, class Arg>
	vector<Ty> make_vector(Arg A) {}
	)cpp";

	FileIndex M;
	update(M, "f", Source);

	auto Symbols = runFuzzyFind(M, "");
	EXPECT_THAT(Symbols,
	UnorderedElementsAre(QName("vector"), QName("make_vector")));
	auto It = Symbols.begin();
	Symbol Vector = *It++;
	Symbol MakeVector = *It++;
	if (MakeVector.Name == "vector")
	std::swap(MakeVector, Vector);

	EXPECT_EQ(Vector.Signature, "<class Ty>");
	EXPECT_EQ(Vector.CompletionSnippetSuffix, "<${1:class Ty}>");

	EXPECT_EQ(MakeVector.Signature, "<class Ty>(Arg A)");
	EXPECT_EQ(MakeVector.CompletionSnippetSuffix, "<${1:class Ty}>(${2:Arg A})");
	}

	TEST(FileIndexTest, RebuildWithPreamble) {
	auto FooCpp = testPath("foo.cpp");
	auto FooH = testPath("foo.h");
	// Preparse ParseInputs.
	ParseInputs PI;
	PI.CompileCommand.Directory = testRoot();
	PI.CompileCommand.Filename = FooCpp;
	PI.CompileCommand.CommandLine = {"clang", "-xc++", FooCpp};

	llvm::StringMap<std::string> Files;
	Files[FooCpp] = "";
	Files[FooH] = R"cpp(
	namespace ns_in_header {
	int func_in_header();
	}
	)cpp";
	PI.FS = buildTestFS(std::move(Files));

	PI.Contents = R"cpp(
	#include "foo.h"
	namespace ns_in_source {
	int func_in_source();
	}
	)cpp";

	// Rebuild the file.
	auto CI = buildCompilerInvocation(PI);

	FileIndex Index;
	bool IndexUpdated = false;
	buildPreamble(
	FooCpp, CI, /OldPreamble=*/nullptr, tooling::CompileCommand(), PI,
	std::make_shared<PCHContainerOperations>(), /StoreInMemory=/true,
	[&](ASTContext &Ctx, std::shared_ptr<Preprocessor> PP,
	const CanonicalIncludes &CanonIncludes) {
	EXPECT_FALSE(IndexUpdated) << "Expected only a single index update";
	IndexUpdated = true;
	Index.updatePreamble(FooCpp, Ctx, std::move(PP), CanonIncludes);
	});
	ASSERT_TRUE(IndexUpdated);

	// Check the index contains symbols from the preamble, but not from the main
	// file.
	FuzzyFindRequest Req;
	Req.Query = "";
	Req.Scopes = {"", "ns_in_header::"};

	EXPECT_THAT(runFuzzyFind(Index, Req),
	UnorderedElementsAre(QName("ns_in_header"),
	QName("ns_in_header::func_in_header")));
	}

	TEST(FileIndexTest, Refs) {
	const char *HeaderCode = "class Foo {};";
	Annotations MainCode(R"cpp(
	void f() {
	$foo[[Foo]] foo;
	}
	)cpp");

	auto Foo =
	findSymbol(TestTU::withHeaderCode(HeaderCode).headerSymbols(), "Foo");

	RefsRequest Request;
	Request.IDs = {Foo.ID};

	FileIndex Index;
	// Add test.cc
	TestTU Test;
	Test.HeaderCode = HeaderCode;
	Test.Code = MainCode.code();
	Test.Filename = "test.cc";
	auto AST = Test.build();
	Index.updateMain(Test.Filename, AST);
	// Add test2.cc
	TestTU Test2;
	Test2.HeaderCode = HeaderCode;
	Test2.Code = MainCode.code();
	Test2.Filename = "test2.cc";
	AST = Test2.build();
	Index.updateMain(Test2.Filename, AST);

	EXPECT_THAT(getRefs(Index, Foo.ID),
	RefsAre({AllOf(RefRange(MainCode.range("foo")),
	FileURI("unittest:///test.cc")),
	AllOf(RefRange(MainCode.range("foo")),
	FileURI("unittest:///test2.cc"))}));
	}

	TEST(FileIndexTest, CollectMacros) {
	FileIndex M;
	update(M, "f", "#define CLANGD 1");
	EXPECT_THAT(runFuzzyFind(M, ""), Contains(QName("CLANGD")));
	}

	TEST(FileIndexTest, ReferencesInMainFileWithPreamble) {
	const std::string Header = R"cpp(
	class Foo {};
	)cpp";
	Annotations Main(R"cpp(
	#include "foo.h"
	void f() {
	[[Foo]] foo;
	}
	)cpp");
	auto MainFile = testPath("foo.cpp");
	auto HeaderFile = testPath("foo.h");
	std::vector<const char *> Cmd = {"clang", "-xc++", MainFile.c_str()};
	// Preparse ParseInputs.
	ParseInputs PI;
	PI.CompileCommand.Directory = testRoot();
	PI.CompileCommand.Filename = MainFile;
	PI.CompileCommand.CommandLine = {Cmd.begin(), Cmd.end()};
	PI.Contents = Main.code();
	PI.FS = buildTestFS({{MainFile, Main.code()}, {HeaderFile, Header}});

	// Prepare preamble.
	auto CI = buildCompilerInvocation(PI);
	auto PreambleData = buildPreamble(
	MainFile, buildCompilerInvocation(PI), /OldPreamble=*/nullptr,
	tooling::CompileCommand(), PI, std::make_shared<PCHContainerOperations>(),
	/StoreInMemory=/true,
	[&](ASTContext &Ctx, std::shared_ptr<Preprocessor> PP,
	const CanonicalIncludes &) {});
	// Build AST for main file with preamble.
	auto AST =
	ParsedAST::build(createInvocationFromCommandLine(Cmd), PreambleData,
	llvm::MemoryBuffer::getMemBufferCopy(Main.code()),
	std::make_shared<PCHContainerOperations>(), PI.FS,
	/Index=/nullptr, ParseOptions());
	ASSERT_TRUE(AST);
	FileIndex Index;
	Index.updateMain(MainFile, *AST);

	auto Foo = findSymbol(TestTU::withHeaderCode(Header).headerSymbols(), "Foo");
	RefsRequest Request;
	Request.IDs.insert(Foo.ID);

	// Expect to see references in main file, references in headers are excluded
	// because we only index main AST.
	EXPECT_THAT(getRefs(Index, Foo.ID), RefsAre({RefRange(Main.range())}));
	}

	} // namespace
	} // namespace clangd
	} // namespace clang