.net core Url.Action mock，怎么样？

Question

How to mock Url.Action during testing controller action?

I'm trying to unit test my asp.net core controller action. Logic of action has Url.Action and I need to mock it to complete test but I can't find right solution.

Thank you for your help!

UPDATE this is my method in controller that I need to test.

    public async Task<IActionResult> Index(EmailConfirmationViewModel model)
    {
        if (ModelState.IsValid)
        {
            var user = await _userManager.FindByNameAsync(model.Email);

            if (user == null) return RedirectToAction("UserNotFound");
            if (await _userManager.IsEmailConfirmedAsync(user)) return RedirectToAction("IsAlreadyConfirmed");

            var token = await _userManager.GenerateEmailConfirmationTokenAsync(user);
            var callbackUrl = Url.Action("Confirm", "EmailConfirmation", new { userId = user.Id, token }, HttpContext.Request.Scheme);

            await _emailService.SendEmailConfirmationTokenAsync(user, callbackUrl);

            return RedirectToAction("EmailSent");
        }

        return View(model);
    }

I have problem with mocking this part:

var callbackUrl = Url.Action("Confirm", "EmailConfirmation", new { userId = user.Id, token }, HttpContext.Request.Scheme);

Answer 1

Finally I found solution!

When you are mocking UrlHelper you need to mock only base method Url.Action(UrlActionContext context) because all helper methods actually use it.

        var mockUrlHelper = new Mock<IUrlHelper>(MockBehavior.Strict);
        mockUrlHelper
            .Setup(
                x => x.Action(
                    It.IsAny<UrlActionContext>()
                )
            )
            .Returns("callbackUrl")
            .Verifiable();

        _controller.Url = mockUrlHelper.Object;

Also! I have problem because of null in HttpContext.Request.Scheme. You need to mock HttpContext

_controller.ControllerContext.HttpContext = new DefaultHttpContext();

Answer 2

I added

var urlHelperMock = new Mock<IUrlHelper>();
urlHelperMock
  .Setup(x => x.Action(It.IsAny<UrlActionContext>()))
  .Returns((UrlActionContext uac) =>
    $"{uac.Controller}/{uac.Action}#{uac.Fragment}?"
    + string.Join("&", new RouteValueDictionary(uac.Values).Select(p => p.Key + "=" + p.Value)));
controller.Url = urlHelperMock.Object;

To my generic Controller setup. Which is a bit roughnready but means I can test any controller logic that generates links.