[lang-ref] Capture stdout/stderr ( cpp )

TEST(Xunit, CaptureStdoutAndStderr) {
	testing::internal::CaptureStdout();
	testing::internal::CaptureStderr();

	std::cout << "[INFO] Hello" << std::endl;
	std::cerr << "[ERROR] Oops.." << std::endl;

	std::string stdout = testing::internal::GetCapturedStdout();
	std::string stderr = testing::internal::GetCapturedStderr();

	EXPECT_EQ(stdout, "[INFO] Hello\n");
	EXPECT_EQ(stderr, "[ERROR] Oops..\n");
}