public void WhenJsonMakesRequestedForDatalessYear_ThenReturnsNoMakes() { const int yearSelected = 1985; MockHandlerFor( () => new Mock <GetYearsMakesAndModels>(null), x => x .Setup(h => h.Execute(yearSelected, null)) .Returns(YearsMakesAndModelsFor.YearWithoutMakes(yearSelected))); TestableVehicleController controller = GetTestableVehicleController(); JsonResult result = controller.MakesForYear(yearSelected); var makeList = (string[])result.Data; Assert.Equal(0, makeList.Count()); }