public void GetPetNamesByOwnerGenderAndPetType_Response_Is_Valid_Test() { var fixture = new Fixture().Customize(new AutoMoqCustomization()); var petOwnerServiceMock = fixture.Freeze <Mock <IOwnerPetService> >(); petOwnerServiceMock.Setup(po => po.GetOwnerPetsByPetTypeAsync("Cat")).Returns(GetMockData()); PetController controller = new PetController(petOwnerServiceMock.Object); var response = controller.GetPetNamesByOwnerGenderAndPetType("Cat"); Assert.IsNotNull(response); }