public void DisplayComments() { IEnumerable<Comment> cmnt = new List<Comment> { new Comment { CommentId =1, UpdateId = 1,CommentText="x"}, new Comment { CommentId =2, UpdateId = 1,CommentText="y"}, new Comment { CommentId =3, UpdateId = 1,CommentText="z"}, }.AsEnumerable(); commentRepository.Setup(x => x.GetMany(It.IsAny<Expression<Func<Comment, bool>>>())).Returns(cmnt); CommentUser cmtuser = new CommentUser() { CommentId = 1, UserId = "402bd590-fdc7-49ad-9728-40efbfe512ec", CommentUserId = 1 }; commentUserRepository.Setup(x => x.Get(It.IsAny<Expression<Func<CommentUser, bool>>>())).Returns(cmtuser); ApplicationUser applicationUser = new ApplicationUser() { Activated = true, Email = "*****@*****.**", FirstName = "Adarsh", LastName = "Vikraman", RoleId = 0 }; userRepository.Setup(x => x.GetById("402bd590-fdc7-49ad-9728-40efbfe512ec")).Returns(applicationUser); GoalController controller = new GoalController(goalService, metricService, focusService, supportService, updateService, commentService, userService, securityTokenService, supportInvitationService, goalStatusService, commentUserService, updateSupportService); Mapper.CreateMap<Comment, CommentsViewModel>(); PartialViewResult rslt = controller.DisplayComments(1) as PartialViewResult; Assert.IsNotNull(rslt, "View Result is null"); Assert.IsInstanceOf(typeof(IEnumerable<CommentsViewModel>), rslt.ViewData.Model, "Wrong View Model"); var cmntsView = rslt.ViewData.Model as IEnumerable<CommentsViewModel>; Assert.AreEqual(3, cmntsView.Count(), "Got wrong number of Comments"); }