public void GetArtist_WithValidId_ShouldReturnArtist() { // arrange var id = Guid.NewGuid(); service.Setup(s => s.Get(id)) .Returns(new Artist { Id = id }); // act var response = controller.GetArtist(id); Artist actual; response.TryGetContentValue(out actual); // assert Assert.That(response.StatusCode == HttpStatusCode.OK); Assert.That(actual, Is.Not.Null); Assert.That(actual.Id == id); }