@Test
public void testAuthenticateUserPlainTextInvalid() throws Exception {

	PasswordValidationCallback.PlainTextPasswordRequest request = new PasswordValidationCallback.PlainTextPasswordRequest(
			"Bert", "Big bird");
	PasswordValidationCallback callback = new PasswordValidationCallback(request);
	callbackHandler.handleInternal(callback);
	boolean authenticated = callback.getResult();
	Assert.assertFalse("Authenticated", authenticated);
}