assertThat(memoryDatabase.getPost("post3"), nullValue())
assertThat(memoryDatabase.getPostReply("reply1"), isPostReply("reply1", "post1", 3000L, "reply1"))
assertThat(memoryDatabase.getPostReply("reply2"), isPostReply("reply2", "post2", 4000L, "reply2"))
assertThat(memoryDatabase.getPost("post3"), nullValue())
assertThat(memoryDatabase.getPostReply("reply1"), isPostReply("reply1", "post1", 3000L, "reply1"))
assertThat(memoryDatabase.getPostReply("reply2"), isPostReply("reply2", "post2", 4000L, "reply2"))