public void GetCallFails_AnyBookIds() { // Setup dependence var settingMock = new Mock<ISettings>(); var componentMock = new Mock<IComponents>(); var uowMock = new Mock<IUnitOfWork>(); var repositoryMock = new Mock<IRepository>(); var serviceLocatorMock = new Mock<IServiceLocator>(); serviceLocatorMock.Setup(r => r.GetInstance<IRepository>()) .Returns(repositoryMock.Object); ServiceLocator.SetLocatorProvider(() => serviceLocatorMock.Object); // Arrange data Guid id = Guid.NewGuid(); Booking book = new Booking { Id = id }; Booking[] books = new Booking[] { book }; repositoryMock.Setup(r => r.FindById<Booking>(id)).Returns(book); // Act CallService callService = new CallService(uowMock.Object, repositoryMock.Object, settingMock.Object, componentMock.Object); var currentCall = callService.GetCallFails(id); // Assert repositoryMock.Verify(r => r.FindById<Booking>(id)); }