public void Given_valid_commentId_When_EditComment_Returns_EditCommentViewModel() { //Given var commentId = 1; var postId = 1; var model = new EditCommentViewModel(); _postBuilder.Setup(x => x.BuildEditCommentViewModel(It.IsAny <int>())).Returns(model); //When var result = _postController.EditComment(commentId, postId) as ViewResult; //Then Assert.NotNull(result); Assert.IsInstanceOf <EditCommentViewModel>(result.Model); Assert.AreEqual(String.Empty, result.ViewName); }