public void GetReturnsRideWithSameId() { string guid = "80b8aa6b-4dde-4df5-9a40-60d2cd4d0e04"; // Arrange var mockRideService = new Mock <IRideService>(); mockRideService.Setup(x => x.GetRideByID(Guid.Parse(guid))) .Returns(new Ride { ID = Guid.Parse(guid) }); var controller = new RideController(mockRideService.Object); // Act var contentResult = controller.GetRideByID(Guid.Parse(guid)); // Assert Assert.NotNull(contentResult); Assert.Equal(Guid.Parse(guid), contentResult.ID); }