'Create cs_comment with minimal fields and register response'

def register_comment(self, overrides=None):

    cs_comment = make_minimal_cs_comment({u'id': u'test_comment', u'course_id': unicode(self.course.id), u'thread_id': u'test_thread', u'username': self.user.username, u'user_id': str(self.user.id), u'body': u'Original    body'})
    cs_comment.update((overrides or {}))
    self.register_get_comment_response(cs_comment)
    self.register_put_comment_response(cs_comment)
    self.register_post_comment_response(cs_comment, thread_id=u'test_thread')
