public async Task Details_Test() { var emailServiceMock = new Mock <IEmailService>().Object; var concreteMailServiceMock = new Mock <IConcreteMailService>().Object; var searchServiceMock = new Mock <ISearchService>().Object; var encodeDecodeServiceMock = new Mock <IEncodeDecodeService>().Object; var id = 1; var controller = new EmailController(emailServiceMock, concreteMailServiceMock, searchServiceMock, encodeDecodeServiceMock); var result = await controller.Details(id); Assert.IsInstanceOfType(result, typeof(ViewResult)); }