assertNotNull(request.getSession().getAttribute("blah"));
assertNotNull(request.getSession().getAttribute("SPRING_SECURITY_SAVED_REQUEST_KEY"));
assertNotNull(eventArgumentCaptor.getValue());
assertTrue(eventArgumentCaptor.getValue() instanceof SessionFixationProtectionEvent);
SessionFixationProtectionEvent event = (SessionFixationProtectionEvent)eventArgumentCaptor.getValue();
assertEquals(oldSessionId, event.getOldSessionId());
assertEquals(request.getSession().getId(), event.getNewSessionId());
assertSame(mockAuthentication, event.getAuthentication());
}