public void TestName() { //Given ICommentData commentData = new CommentData(); Comment userComment = new Comment() { Id = 8, Message = "Just replying" }; Comment userComment1 = new Comment() { Id = 9, Message = "Just replying" }; Comment userComment2 = new Comment() { Id = 10, Message = "Just replying" }; var comment = commentData.GetCommentById(1); comment.Replies.Append(userComment).ToList(); comment.Replies.Append(userComment1).ToList(); comment.Replies.Append(userComment2).ToList(); //When //Then Assert.Equal(2, comment.Replies.Count()); }