public void Get_DeliveryHours_For_DistributionCenter() { var couriers = GetCouriers().AsQueryable(); var center = GetDistributionCenters().FirstOrDefault(c => c.Id == 0); var mockDbSet = new Mock <DbSet <Courier> >(); mockDbSet.As <IQueryable <Courier> >().Setup(p => p.Provider).Returns(couriers.Provider); mockDbSet.As <IQueryable <Courier> >().Setup(p => p.Expression).Returns(couriers.Expression); mockDbSet.As <IQueryable <Courier> >().Setup(p => p.ElementType).Returns(couriers.ElementType); mockDbSet.As <IQueryable <Courier> >().Setup(p => p.GetEnumerator()).Returns(couriers.GetEnumerator); var mockContext = new Mock <RentalContext>(); mockContext.Setup(r => r.Couriers).Returns(mockDbSet.Object); var service = new DistributionService(mockContext.Object); var results = service.GetDeliveryHours(center.Id); results.Should().HaveCount(5); }