public void GetTripsWithWrongUserTest() { var data = new List <UserModel> { new UserModel() { Id = 1, Token = "aa", Username = "******", Password = "******", Email = "@gmail" } }.AsQueryable(); var mockSet = new Mock <DbSet <UserModel> >(); mockSet.As <IQueryable <UserModel> >().Setup(m => m.Provider).Returns(data.Provider); mockSet.As <IQueryable <UserModel> >().Setup(m => m.Expression).Returns(data.Expression); mockSet.As <IQueryable <UserModel> >().Setup(m => m.ElementType).Returns(data.ElementType); mockSet.As <IQueryable <UserModel> >().Setup(m => m.GetEnumerator()).Returns(data.GetEnumerator()); var dataTrips = new List <TripModel> { new TripModel() { Id = 1, TripName = "trip1", TimestampTo = DateTime.Now, TimestampFrom = DateTime.Now, UserId = 1 } }.AsQueryable(); var mockSetTrips = new Mock <DbSet <TripModel> >(); mockSetTrips.As <IQueryable <TripModel> >().Setup(m => m.Provider).Returns(dataTrips.Provider); mockSetTrips.As <IQueryable <TripModel> >().Setup(m => m.Expression).Returns(dataTrips.Expression); mockSetTrips.As <IQueryable <TripModel> >().Setup(m => m.ElementType).Returns(dataTrips.ElementType); mockSetTrips.As <IQueryable <TripModel> >().Setup(m => m.GetEnumerator()).Returns(dataTrips.GetEnumerator()); var options = new DbContextOptionsBuilder <MyDbContext>() .Options; var mockContext = new Mock <MyDbContext>(options); mockContext.Setup(x => x.Users).Returns(mockSet.Object); mockContext.Setup(x => x.Trips).Returns(mockSetTrips.Object); var service = new TripController(mockContext.Object); var _ = service.GetTrips(2); Assert.IsNull(_.Result.Value); }