public void SearchUserForGroup() { IEnumerable<ApplicationUser> fakeUser = new List<ApplicationUser> { new ApplicationUser{Activated=true,Email="*****@*****.**",FirstName="user1",LastName="user1",RoleId=0}, new ApplicationUser{Activated=true,Email="*****@*****.**",FirstName="user2",LastName="user2",RoleId=0}, new ApplicationUser{Activated=true,Email="*****@*****.**",FirstName="user3",LastName="user3",RoleId=0}, new ApplicationUser{Activated=true,Email="*****@*****.**",FirstName="user4",LastName="user4",RoleId=0} }.AsEnumerable(); userRepository.Setup(x => x.GetMany(It.IsAny<Expression<Func<ApplicationUser, bool>>>())).Returns(fakeUser); Group grp = new Group() { GroupId = 1 }; GroupController controller = new GroupController(groupService, groupUserService, userService, metricService, focusService, groupgoalService, groupInvitationService, securityTokenService, groupUpdateService, groupCommentService, goalStatusService, groupRequestService, followUserService, groupCommentUserService, groupUpdateSupportService, groupUpdateUserService); var searchString = "e"; JsonResult result = controller.SearchUserForGroup(searchString, 1); Assert.IsNotNull(result); Assert.IsInstanceOf(typeof(JsonResult), result); }