public void GetAll_ReturnsAllProducers() { var producersList = new List <Producer> { new Producer { Name = "Alfa Romeo" }, new Producer { Name = "audi" } }; var mockSet = ToDbSet(producersList); _carContext.Producers.Returns(mockSet); var allCars = _producerService.GetAll(); var expected = producersList; Assert.Equal(expected, allCars); }