final MutableAuthentication authentication = new MutableAuthentication(principal);
final List<Authentication> authentications = new ArrayList<Authentication>();
authentications.add(authentication);
final Assertion assertion = new ImmutableAssertionImpl(authentications, TestUtils.getService(), true);
model.put("assertion", assertion);
try {
this.response.renderMergedOutputModel(model, new MockHttpServletRequest(), new MockHttpServletResponse());