if err != nil {
		t.Fatalf("%v", err)
	}
	if len(log) > 0 {
		t.Fatalf("expected no stderr log, got: %s", log)
	}
}

// captureStderr redirects stderr to result string, and then restore stderr from backup
func captureStderr(f func()) (string, error) {
	r, w, err := os.Pipe()
	if err != nil {
		return "", err
	}
	bak := os.Stderr
	os.Stderr = w
	defer func() { os.Stderr = bak }()

//   GetCapturedStdout - stops capturing stdout and returns the captured string.
//   CaptureStderr     - starts capturing stderr.
//   GetCapturedStderr - stops capturing stderr and returns the captured string.
//
GTEST_API_ void CaptureStdout();
GTEST_API_ std::string GetCapturedStdout();
GTEST_API_ void CaptureStderr();
GTEST_API_ std::string GetCapturedStderr();

#endif  // GTEST_HAS_STREAM_REDIRECTION

//   GetCapturedStdout - stops capturing stdout and returns the captured string.
//   CaptureStderr     - starts capturing stderr.
//   GetCapturedStderr - stops capturing stderr and returns the captured string.
//
GTEST_API_ void CaptureStdout();
GTEST_API_ std::string GetCapturedStdout();
GTEST_API_ void CaptureStderr();
GTEST_API_ std::string GetCapturedStderr();

#endif  // GTEST_HAS_STREAM_REDIRECTION