util method that runs TestNG test classes and verify the result

I wrote a utility class for my project.

The method does:

• run TestNG tests programmatically
• verify the failures happened in TestNG tests run
• If there is a failure, combine all assertion messages including stack trace, then make a single AssertionError

(I'm also using google-guava)

	public class TestNGUtils {
	private static final String LINE_SEPARATOR = System.getProperty("line.separator");
	public static void runAndVerify(Class<?>... testClasses) {
	if (ObjectUtils.isEmpty(testClasses)) {
	throw new AssertionError("no test class specified.");
	}
	// run testng tests
	TestListenerAdapter tla = new TestListenerAdapter();
	TestNG testNG = new TestNG();
	testNG.setTestClasses(testClasses);
	testNG.addListener(tla);
	testNG.run();
	List<ITestResult> failedTests = Lists.newArrayList();
	failedTests.addAll(tla.getFailedTests());
	failedTests.addAll(tla.getConfigurationFailures());
	if (!failedTests.isEmpty()) {
	String header = String.format("Combined Messages (Total:%d)", failedTests.size());
	List<String> errorMessages = Lists.newArrayList();
	errorMessages.add(header);
	errorMessages.addAll(Lists.transform(failedTests, new Function<ITestResult, String>() {
	int i = 1;
	@Override
	public String apply(ITestResult testResult) {
	String stackTraceString = Throwables.getStackTraceAsString(testResult.getThrowable());
	String template = "Message-%d: %n %s";
	return String.format(template, i++, stackTraceString);
	}
	}));
	// transform messages to a single combined string
	String message = Joiner.on(LINE_SEPARATOR).join(errorMessages);
	throw new AssertionError(message);
	}
	}
	}

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