private void assertAnswerMavIsCorrect(ModelAndView mav) {
assertViewName(mav, "topic/answer");
assertAndReturnModelAttributeOfType(mav, "topic", Topic.class);
long topicId = assertAndReturnModelAttributeOfType(mav, "topicId", Long.class);
assertEquals(topicId, TOPIC_ID);
PostDto dto = assertAndReturnModelAttributeOfType(mav, "postDto", PostDto.class);
assertEquals(dto.getId(), 0);
assertModelAttributeAvailable(mav, "breadcrumbList");
}