public void OwnerControllerTest_GetAllOwnerPetList_OK() { var mockOwnerPetService = new Mock <IOwnerPetService>(); List <OwnerPet> ownerPetList = new List <OwnerPet>(); mockOwnerPetService.Setup(x => x.GetAllOwnerPetList()).ReturnsAsync(ownerPetList); var controller = new OwnerController(mockOwnerPetService.Object) { }; // Act var response = controller.GetAllOwnerPetList(); // Assert Assert.IsInstanceOfType(response, typeof(Task <PetOwnerDTO.OwnerPetList>), "Correct Model"); }