具有异步ActionResult的Moq MVC控制器

Question

I am trying to moq this Controller action

public async Task<ActionResult> Index(decimal total, string from, string to)
        {

            decimal result = 0.00m;
            await Helper.GetEmployeeSalaryAsync(total, fromCurrency, toCurrency ,ConvertedValue =>
            {
                result = ConvertedValue;
                TempData["ConvertedResult"] = result;

            }).ConfigureAwait(false);

            return View();
        }

using this test method

[TestMethod]
public void  Index_Should_Return_View_With_Converted_Currency()
{
    ActionResult resultView = null;
    decimal testToConvert = 110.00m;
    string from = "Home";
    string to = "Remote";


    var moq = new Mock<HomeController>();

    moq.Setup(x => x.Index(testToConvert, from, to))
        .ReturnsAsync(resultView)
        .Verifiable();
}

When I run the test I get this error "Invalid setup on a non-virtual (overridable in VB) member: x => x.Index(.testToConvert, .from, .to)"}"

any idea how to properly set up a moc for this. I am trying to test the Tempdata["test"] existing and value. Thank you

UPDATE: All I needed to do is to test the Async ActionResult. Here is the final unit test

public async Task  Index_Should_Return_View_With_Converted_Currency()
        {

            decimal testToConvert = 110.00m;

            string from = "Home";
            string to = "Remote";
            HomeController controller = new HomeController();
         var  result = (ViewResult)  await controller.Index(testToConvert, from, to) ;

            Assert.IsNotNull(result.TempData["ConvertedResult"]);

        }

Answer 1

The method Index needs to be declared virtual otherwise the mocking framework cannot intercept it. This is a common limitation of mocking frameworks that use Castle Dynamic Proxy . Rhino Mocks has the same problem, to get around it use dependency injection and pass objects around using interfaces as interfaces can always be mocked.

Is there an IHomeController ? Then you just need to change this line:

var moq = new Mock<IHomeController>();