unittests/Support/ProgramTest.cpp - llvm - Git at Google

 //===- unittest/Support/ProgramTest.cpp -----------------------------------===//
 //
 //                     The LLVM Compiler Infrastructure
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//

 #include "llvm/Support/CommandLine.h"
 #include "llvm/Support/FileSystem.h"
 #include "llvm/Support/Path.h"
 #include "llvm/Support/Program.h"
 #include "gtest/gtest.h"
 #include <stdlib.h>
 #if defined(__APPLE__)
 # include <crt_externs.h>
 #elif !defined(_MSC_VER)
 // Forward declare environ in case it's not provided by stdlib.h.
 extern char **environ;
 #endif

 #if defined(LLVM_ON_UNIX)
 #include <unistd.h>
 void sleep_for(unsigned int seconds) {
   sleep(seconds);
 }
 #elif defined(LLVM_ON_WIN32)
 #include <windows.h>
 void sleep_for(unsigned int seconds) {
   Sleep(seconds * 1000);
 }
 #else
 #error sleep_for is not implemented on your platform.
 #endif

 #define ASSERT_NO_ERROR(x)                                                     \
   if (std::error_code ASSERT_NO_ERROR_ec = x) {                                \
     SmallString<128> MessageStorage;                                           \
     raw_svector_ostream Message(MessageStorage);                               \
     Message << #x ": did not return errc::success.\n"                          \
             << "error number: " << ASSERT_NO_ERROR_ec.value() << "\n"          \
             << "error message: " << ASSERT_NO_ERROR_ec.message() << "\n";      \
     GTEST_FATAL_FAILURE_(MessageStorage.c_str());                              \
   } else {                                                                     \
   }
 // From TestMain.cpp.
 extern const char *TestMainArgv0;

 namespace {

 using namespace llvm;
 using namespace sys;

 static cl::opt<std::string>
 ProgramTestStringArg1("program-test-string-arg1");
 static cl::opt<std::string>
 ProgramTestStringArg2("program-test-string-arg2");

 static void CopyEnvironment(std::vector<const char *> &out) {
 #ifdef __APPLE__
   char **envp = *_NSGetEnviron();
 #else
   // environ seems to work for Windows and most other Unices.
   char **envp = environ;
 #endif
   while (*envp != nullptr) {
     out.push_back(*envp);
     ++envp;
   }
 }

 #ifdef LLVM_ON_WIN32
 TEST(ProgramTest, CreateProcessLongPath) {
   if (getenv("LLVM_PROGRAM_TEST_LONG_PATH"))
     exit(0);

   // getMainExecutable returns an absolute path; prepend the long-path prefix.
   std::string MyAbsExe =
       sys::fs::getMainExecutable(TestMainArgv0, &ProgramTestStringArg1);
   std::string MyExe;
   if (!StringRef(MyAbsExe).startswith("\\\\?\\"))
     MyExe.append("\\\\?\\");
   MyExe.append(MyAbsExe);

   const char *ArgV[] = {
     MyExe.c_str(),
     "--gtest_filter=ProgramTest.CreateProcessLongPath",
     nullptr
   };

   // Add LLVM_PROGRAM_TEST_LONG_PATH to the environment of the child.
   std::vector<const char *> EnvP;
   CopyEnvironment(EnvP);
   EnvP.push_back("LLVM_PROGRAM_TEST_LONG_PATH=1");
   EnvP.push_back(nullptr);

   // Redirect stdout to a long path.
   SmallString<128> TestDirectory;
   ASSERT_NO_ERROR(
     fs::createUniqueDirectory("program-redirect-test", TestDirectory));
   SmallString<256> LongPath(TestDirectory);
   LongPath.push_back('\\');
   // MAX_PATH = 260
   LongPath.append(260 - TestDirectory.size(), 'a');
   StringRef LongPathRef(LongPath);

   std::string Error;
   bool ExecutionFailed;
   const StringRef *Redirects[] = { nullptr, &LongPathRef, nullptr };
   int RC = ExecuteAndWait(MyExe, ArgV, &EnvP[0], Redirects,
     /*secondsToWait=*/ 10, /*memoryLimit=*/ 0, &Error,
     &ExecutionFailed);
   EXPECT_FALSE(ExecutionFailed) << Error;
   EXPECT_EQ(0, RC);

   // Remove the long stdout.
   ASSERT_NO_ERROR(fs::remove(Twine(LongPath)));
   ASSERT_NO_ERROR(fs::remove(Twine(TestDirectory)));
 }
 #endif

 TEST(ProgramTest, CreateProcessTrailingSlash) {
   if (getenv("LLVM_PROGRAM_TEST_CHILD")) {
     if (ProgramTestStringArg1 == "has\\\\ trailing\\" &&
         ProgramTestStringArg2 == "has\\\\ trailing\\") {
       exit(0);  // Success!  The arguments were passed and parsed.
     }
     exit(1);
   }

   std::string my_exe =
       sys::fs::getMainExecutable(TestMainArgv0, &ProgramTestStringArg1);
   const char *argv[] = {
     my_exe.c_str(),
     "--gtest_filter=ProgramTest.CreateProcessTrailingSlash",
     "-program-test-string-arg1", "has\\\\ trailing\\",
     "-program-test-string-arg2", "has\\\\ trailing\\",
     nullptr
   };

   // Add LLVM_PROGRAM_TEST_CHILD to the environment of the child.
   std::vector<const char *> envp;
   CopyEnvironment(envp);
   envp.push_back("LLVM_PROGRAM_TEST_CHILD=1");
   envp.push_back(nullptr);

   std::string error;
   bool ExecutionFailed;
   // Redirect stdout and stdin to NUL, but let stderr through.
 #ifdef LLVM_ON_WIN32
   StringRef nul("NUL");
 #else
   StringRef nul("/dev/null");
 #endif
   const StringRef *redirects[] = { &nul, &nul, nullptr };
   int rc = ExecuteAndWait(my_exe, argv, &envp[0], redirects,
                           /*secondsToWait=*/ 10, /*memoryLimit=*/ 0, &error,
                           &ExecutionFailed);
   EXPECT_FALSE(ExecutionFailed) << error;
   EXPECT_EQ(0, rc);
 }

 TEST(ProgramTest, TestExecuteNoWait) {
   using namespace llvm::sys;

   if (getenv("LLVM_PROGRAM_TEST_EXECUTE_NO_WAIT")) {
     sleep_for(/*seconds*/ 1);
     exit(0);
   }

   std::string Executable =
       sys::fs::getMainExecutable(TestMainArgv0, &ProgramTestStringArg1);
   const char *argv[] = {
     Executable.c_str(),
     "--gtest_filter=ProgramTest.TestExecuteNoWait",
     nullptr
   };

   // Add LLVM_PROGRAM_TEST_EXECUTE_NO_WAIT to the environment of the child.
   std::vector<const char *> envp;
   CopyEnvironment(envp);
   envp.push_back("LLVM_PROGRAM_TEST_EXECUTE_NO_WAIT=1");
   envp.push_back(nullptr);

   std::string Error;
   bool ExecutionFailed;
   ProcessInfo PI1 = ExecuteNoWait(Executable, argv, &envp[0], nullptr, 0,
                                   &Error, &ExecutionFailed);
   ASSERT_FALSE(ExecutionFailed) << Error;
   ASSERT_NE(PI1.Pid, 0) << "Invalid process id";

   unsigned LoopCount = 0;

   // Test that Wait() with WaitUntilTerminates=true works. In this case,
   // LoopCount should only be incremented once.
   while (true) {
     ++LoopCount;
     ProcessInfo WaitResult = Wait(PI1, 0, true, &Error);
     ASSERT_TRUE(Error.empty());
     if (WaitResult.Pid == PI1.Pid)
       break;
   }

   EXPECT_EQ(LoopCount, 1u) << "LoopCount should be 1";

   ProcessInfo PI2 = ExecuteNoWait(Executable, argv, &envp[0], nullptr, 0,
                                   &Error, &ExecutionFailed);
   ASSERT_FALSE(ExecutionFailed) << Error;
   ASSERT_NE(PI2.Pid, 0) << "Invalid process id";

   // Test that Wait() with SecondsToWait=0 performs a non-blocking wait. In this
   // cse, LoopCount should be greater than 1 (more than one increment occurs).
   while (true) {
     ++LoopCount;
     ProcessInfo WaitResult = Wait(PI2, 0, false, &Error);
     ASSERT_TRUE(Error.empty());
     if (WaitResult.Pid == PI2.Pid)
       break;
   }

   ASSERT_GT(LoopCount, 1u) << "LoopCount should be >1";
 }

 TEST(ProgramTest, TestExecuteAndWaitTimeout) {
   using namespace llvm::sys;

   if (getenv("LLVM_PROGRAM_TEST_TIMEOUT")) {
     sleep_for(/*seconds*/ 10);
     exit(0);
   }

   std::string Executable =
       sys::fs::getMainExecutable(TestMainArgv0, &ProgramTestStringArg1);
   const char *argv[] = {
     Executable.c_str(),
     "--gtest_filter=ProgramTest.TestExecuteAndWaitTimeout",
     nullptr
   };

   // Add LLVM_PROGRAM_TEST_TIMEOUT to the environment of the child.
   std::vector<const char *> envp;
   CopyEnvironment(envp);
   envp.push_back("LLVM_PROGRAM_TEST_TIMEOUT=1");
   envp.push_back(nullptr);

   std::string Error;
   bool ExecutionFailed;
   int RetCode =
       ExecuteAndWait(Executable, argv, &envp[0], nullptr, /*secondsToWait=*/1, 0,
                      &Error, &ExecutionFailed);
   ASSERT_EQ(-2, RetCode);
 }

 TEST(ProgramTest, TestExecuteNegative) {
   std::string Executable = "i_dont_exist";
   const char *argv[] = { Executable.c_str(), nullptr };

   {
     std::string Error;
     bool ExecutionFailed;
     int RetCode = ExecuteAndWait(Executable, argv, nullptr, nullptr, 0, 0,
                                  &Error, &ExecutionFailed);
     ASSERT_TRUE(RetCode < 0) << "On error ExecuteAndWait should return 0 or "
                                 "positive value indicating the result code";
     ASSERT_TRUE(ExecutionFailed);
     ASSERT_FALSE(Error.empty());
   }

   {
     std::string Error;
     bool ExecutionFailed;
     ProcessInfo PI = ExecuteNoWait(Executable, argv, nullptr, nullptr, 0,
                                    &Error, &ExecutionFailed);
     ASSERT_EQ(PI.Pid, 0)
         << "On error ExecuteNoWait should return an invalid ProcessInfo";
     ASSERT_TRUE(ExecutionFailed);
     ASSERT_FALSE(Error.empty());
   }

 }

 #ifdef LLVM_ON_WIN32
 const char utf16le_text[] =
     "\x6c\x00\x69\x00\x6e\x00\x67\x00\xfc\x00\x69\x00\xe7\x00\x61\x00";
 const char utf16be_text[] =
     "\x00\x6c\x00\x69\x00\x6e\x00\x67\x00\xfc\x00\x69\x00\xe7\x00\x61";
 #endif
 const char utf8_text[] = "\x6c\x69\x6e\x67\xc3\xbc\x69\xc3\xa7\x61";

 TEST(ProgramTest, TestWriteWithSystemEncoding) {
   SmallString<128> TestDirectory;
   ASSERT_NO_ERROR(fs::createUniqueDirectory("program-test", TestDirectory));
   errs() << "Test Directory: " << TestDirectory << '\n';
   errs().flush();
   SmallString<128> file_pathname(TestDirectory);
   path::append(file_pathname, "international-file.txt");
   // Only on Windows we should encode in UTF16. For other systems, use UTF8
   ASSERT_NO_ERROR(sys::writeFileWithEncoding(file_pathname.c_str(), utf8_text,
                                              sys::WEM_UTF16));
   int fd = 0;
   ASSERT_NO_ERROR(fs::openFileForRead(file_pathname.c_str(), fd));
 #if defined(LLVM_ON_WIN32)
   char buf[18];
   ASSERT_EQ(::read(fd, buf, 18), 18);
   if (strncmp(buf, "\xfe\xff", 2) == 0) { // UTF16-BE
     ASSERT_EQ(strncmp(&buf[2], utf16be_text, 16), 0);
   } else if (strncmp(buf, "\xff\xfe", 2) == 0) { // UTF16-LE
     ASSERT_EQ(strncmp(&buf[2], utf16le_text, 16), 0);
   } else {
     FAIL() << "Invalid BOM in UTF-16 file";
   }
 #else
   char buf[10];
   ASSERT_EQ(::read(fd, buf, 10), 10);
   ASSERT_EQ(strncmp(buf, utf8_text, 10), 0);
 #endif
   ::close(fd);
   ASSERT_NO_ERROR(fs::remove(file_pathname.str()));
   ASSERT_NO_ERROR(fs::remove(TestDirectory.str()));
 }

 } // end anonymous namespace
	//===- unittest/Support/ProgramTest.cpp -----------------------------------===//
	//
	// The LLVM Compiler Infrastructure
	//
	// This file is distributed under the University of Illinois Open Source
	// License. See LICENSE.TXT for details.
	//
	//===----------------------------------------------------------------------===//

	#include "llvm/Support/CommandLine.h"
	#include "llvm/Support/FileSystem.h"
	#include "llvm/Support/Path.h"
	#include "llvm/Support/Program.h"
	#include "gtest/gtest.h"
	#include <stdlib.h>
	#if defined(__APPLE__)
	# include <crt_externs.h>
	#elif !defined(_MSC_VER)
	// Forward declare environ in case it's not provided by stdlib.h.
	extern char **environ;
	#endif

	#if defined(LLVM_ON_UNIX)
	#include <unistd.h>
	void sleep_for(unsigned int seconds) {
	sleep(seconds);
	}
	#elif defined(LLVM_ON_WIN32)
	#include <windows.h>
	void sleep_for(unsigned int seconds) {
	Sleep(seconds * 1000);
	}
	#else
	#error sleep_for is not implemented on your platform.
	#endif

	#define ASSERT_NO_ERROR(x) \
	if (std::error_code ASSERT_NO_ERROR_ec = x) { \
	SmallString<128> MessageStorage; \
	raw_svector_ostream Message(MessageStorage); \
	Message << #x ": did not return errc::success.\n" \
	<< "error number: " << ASSERT_NO_ERROR_ec.value() << "\n" \
	<< "error message: " << ASSERT_NO_ERROR_ec.message() << "\n"; \
	GTEST_FATAL_FAILURE_(MessageStorage.c_str()); \
	} else { \
	}
	// From TestMain.cpp.
	extern const char *TestMainArgv0;

	namespace {

	using namespace llvm;
	using namespace sys;

	static cl::opt<std::string>
	ProgramTestStringArg1("program-test-string-arg1");
	static cl::opt<std::string>
	ProgramTestStringArg2("program-test-string-arg2");

	static void CopyEnvironment(std::vector<const char *> &out) {
	#ifdef __APPLE__
	char *envp = _NSGetEnviron();
	#else
	// environ seems to work for Windows and most other Unices.
	char **envp = environ;
	#endif
	while (*envp != nullptr) {
	out.push_back(*envp);
	++envp;
	}
	}

	#ifdef LLVM_ON_WIN32
	TEST(ProgramTest, CreateProcessLongPath) {
	if (getenv("LLVM_PROGRAM_TEST_LONG_PATH"))
	exit(0);

	// getMainExecutable returns an absolute path; prepend the long-path prefix.
	std::string MyAbsExe =
	sys::fs::getMainExecutable(TestMainArgv0, &ProgramTestStringArg1);
	std::string MyExe;
	if (!StringRef(MyAbsExe).startswith("\\\\?\\"))
	MyExe.append("\\\\?\\");
	MyExe.append(MyAbsExe);

	const char *ArgV[] = {
	MyExe.c_str(),
	"--gtest_filter=ProgramTest.CreateProcessLongPath",
	nullptr
	};

	// Add LLVM_PROGRAM_TEST_LONG_PATH to the environment of the child.
	std::vector<const char *> EnvP;
	CopyEnvironment(EnvP);
	EnvP.push_back("LLVM_PROGRAM_TEST_LONG_PATH=1");
	EnvP.push_back(nullptr);

	// Redirect stdout to a long path.
	SmallString<128> TestDirectory;
	ASSERT_NO_ERROR(
	fs::createUniqueDirectory("program-redirect-test", TestDirectory));
	SmallString<256> LongPath(TestDirectory);
	LongPath.push_back('\\');
	// MAX_PATH = 260
	LongPath.append(260 - TestDirectory.size(), 'a');
	StringRef LongPathRef(LongPath);

	std::string Error;
	bool ExecutionFailed;
	const StringRef *Redirects[] = { nullptr, &LongPathRef, nullptr };
	int RC = ExecuteAndWait(MyExe, ArgV, &EnvP[0], Redirects,
	/secondsToWait=/ 10, /memoryLimit=/ 0, &Error,
	&ExecutionFailed);
	EXPECT_FALSE(ExecutionFailed) << Error;
	EXPECT_EQ(0, RC);

	// Remove the long stdout.
	ASSERT_NO_ERROR(fs::remove(Twine(LongPath)));
	ASSERT_NO_ERROR(fs::remove(Twine(TestDirectory)));
	}
	#endif

	TEST(ProgramTest, CreateProcessTrailingSlash) {
	if (getenv("LLVM_PROGRAM_TEST_CHILD")) {
	if (ProgramTestStringArg1 == "has\\\\ trailing\\" &&
	ProgramTestStringArg2 == "has\\\\ trailing\\") {
	exit(0); // Success! The arguments were passed and parsed.
	}
	exit(1);
	}

	std::string my_exe =
	sys::fs::getMainExecutable(TestMainArgv0, &ProgramTestStringArg1);
	const char *argv[] = {
	my_exe.c_str(),
	"--gtest_filter=ProgramTest.CreateProcessTrailingSlash",
	"-program-test-string-arg1", "has\\\\ trailing\\",
	"-program-test-string-arg2", "has\\\\ trailing\\",
	nullptr
	};

	// Add LLVM_PROGRAM_TEST_CHILD to the environment of the child.
	std::vector<const char *> envp;
	CopyEnvironment(envp);
	envp.push_back("LLVM_PROGRAM_TEST_CHILD=1");
	envp.push_back(nullptr);

	std::string error;
	bool ExecutionFailed;
	// Redirect stdout and stdin to NUL, but let stderr through.
	#ifdef LLVM_ON_WIN32
	StringRef nul("NUL");
	#else
	StringRef nul("/dev/null");
	#endif
	const StringRef *redirects[] = { &nul, &nul, nullptr };
	int rc = ExecuteAndWait(my_exe, argv, &envp[0], redirects,
	/secondsToWait=/ 10, /memoryLimit=/ 0, &error,
	&ExecutionFailed);
	EXPECT_FALSE(ExecutionFailed) << error;
	EXPECT_EQ(0, rc);
	}

	TEST(ProgramTest, TestExecuteNoWait) {
	using namespace llvm::sys;

	if (getenv("LLVM_PROGRAM_TEST_EXECUTE_NO_WAIT")) {
	sleep_for(/seconds/ 1);
	exit(0);
	}

	std::string Executable =
	sys::fs::getMainExecutable(TestMainArgv0, &ProgramTestStringArg1);
	const char *argv[] = {
	Executable.c_str(),
	"--gtest_filter=ProgramTest.TestExecuteNoWait",
	nullptr
	};

	// Add LLVM_PROGRAM_TEST_EXECUTE_NO_WAIT to the environment of the child.
	std::vector<const char *> envp;
	CopyEnvironment(envp);
	envp.push_back("LLVM_PROGRAM_TEST_EXECUTE_NO_WAIT=1");
	envp.push_back(nullptr);

	std::string Error;
	bool ExecutionFailed;
	ProcessInfo PI1 = ExecuteNoWait(Executable, argv, &envp[0], nullptr, 0,
	&Error, &ExecutionFailed);
	ASSERT_FALSE(ExecutionFailed) << Error;
	ASSERT_NE(PI1.Pid, 0) << "Invalid process id";

	unsigned LoopCount = 0;

	// Test that Wait() with WaitUntilTerminates=true works. In this case,
	// LoopCount should only be incremented once.
	while (true) {
	++LoopCount;
	ProcessInfo WaitResult = Wait(PI1, 0, true, &Error);
	ASSERT_TRUE(Error.empty());
	if (WaitResult.Pid == PI1.Pid)
	break;
	}

	EXPECT_EQ(LoopCount, 1u) << "LoopCount should be 1";

	ProcessInfo PI2 = ExecuteNoWait(Executable, argv, &envp[0], nullptr, 0,
	&Error, &ExecutionFailed);
	ASSERT_FALSE(ExecutionFailed) << Error;
	ASSERT_NE(PI2.Pid, 0) << "Invalid process id";

	// Test that Wait() with SecondsToWait=0 performs a non-blocking wait. In this
	// cse, LoopCount should be greater than 1 (more than one increment occurs).
	while (true) {
	++LoopCount;
	ProcessInfo WaitResult = Wait(PI2, 0, false, &Error);
	ASSERT_TRUE(Error.empty());
	if (WaitResult.Pid == PI2.Pid)
	break;
	}

	ASSERT_GT(LoopCount, 1u) << "LoopCount should be >1";
	}

	TEST(ProgramTest, TestExecuteAndWaitTimeout) {
	using namespace llvm::sys;

	if (getenv("LLVM_PROGRAM_TEST_TIMEOUT")) {
	sleep_for(/seconds/ 10);
	exit(0);
	}

	std::string Executable =
	sys::fs::getMainExecutable(TestMainArgv0, &ProgramTestStringArg1);
	const char *argv[] = {
	Executable.c_str(),
	"--gtest_filter=ProgramTest.TestExecuteAndWaitTimeout",
	nullptr
	};

	// Add LLVM_PROGRAM_TEST_TIMEOUT to the environment of the child.
	std::vector<const char *> envp;
	CopyEnvironment(envp);
	envp.push_back("LLVM_PROGRAM_TEST_TIMEOUT=1");
	envp.push_back(nullptr);

	std::string Error;
	bool ExecutionFailed;
	int RetCode =
	ExecuteAndWait(Executable, argv, &envp[0], nullptr, /secondsToWait=/1, 0,
	&Error, &ExecutionFailed);
	ASSERT_EQ(-2, RetCode);
	}

	TEST(ProgramTest, TestExecuteNegative) {
	std::string Executable = "i_dont_exist";
	const char *argv[] = { Executable.c_str(), nullptr };

	{
	std::string Error;
	bool ExecutionFailed;
	int RetCode = ExecuteAndWait(Executable, argv, nullptr, nullptr, 0, 0,
	&Error, &ExecutionFailed);
	ASSERT_TRUE(RetCode < 0) << "On error ExecuteAndWait should return 0 or "
	"positive value indicating the result code";
	ASSERT_TRUE(ExecutionFailed);
	ASSERT_FALSE(Error.empty());
	}

	{
	std::string Error;
	bool ExecutionFailed;
	ProcessInfo PI = ExecuteNoWait(Executable, argv, nullptr, nullptr, 0,
	&Error, &ExecutionFailed);
	ASSERT_EQ(PI.Pid, 0)
	<< "On error ExecuteNoWait should return an invalid ProcessInfo";
	ASSERT_TRUE(ExecutionFailed);
	ASSERT_FALSE(Error.empty());
	}

	}

	#ifdef LLVM_ON_WIN32
	const char utf16le_text[] =
	"\x6c\x00\x69\x00\x6e\x00\x67\x00\xfc\x00\x69\x00\xe7\x00\x61\x00";
	const char utf16be_text[] =
	"\x00\x6c\x00\x69\x00\x6e\x00\x67\x00\xfc\x00\x69\x00\xe7\x00\x61";
	#endif
	const char utf8_text[] = "\x6c\x69\x6e\x67\xc3\xbc\x69\xc3\xa7\x61";

	TEST(ProgramTest, TestWriteWithSystemEncoding) {
	SmallString<128> TestDirectory;
	ASSERT_NO_ERROR(fs::createUniqueDirectory("program-test", TestDirectory));
	errs() << "Test Directory: " << TestDirectory << '\n';
	errs().flush();
	SmallString<128> file_pathname(TestDirectory);
	path::append(file_pathname, "international-file.txt");
	// Only on Windows we should encode in UTF16. For other systems, use UTF8
	ASSERT_NO_ERROR(sys::writeFileWithEncoding(file_pathname.c_str(), utf8_text,
	sys::WEM_UTF16));
	int fd = 0;
	ASSERT_NO_ERROR(fs::openFileForRead(file_pathname.c_str(), fd));
	#if defined(LLVM_ON_WIN32)
	char buf[18];
	ASSERT_EQ(::read(fd, buf, 18), 18);
	if (strncmp(buf, "\xfe\xff", 2) == 0) { // UTF16-BE
	ASSERT_EQ(strncmp(&buf[2], utf16be_text, 16), 0);
	} else if (strncmp(buf, "\xff\xfe", 2) == 0) { // UTF16-LE
	ASSERT_EQ(strncmp(&buf[2], utf16le_text, 16), 0);
	} else {
	FAIL() << "Invalid BOM in UTF-16 file";
	}
	#else
	char buf[10];
	ASSERT_EQ(::read(fd, buf, 10), 10);
	ASSERT_EQ(strncmp(buf, utf8_text, 10), 0);
	#endif
	::close(fd);
	ASSERT_NO_ERROR(fs::remove(file_pathname.str()));
	ASSERT_NO_ERROR(fs::remove(TestDirectory.str()));
	}

	} // end anonymous namespace