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Mocking MVC user identity with moq

https://dev.to/hatsrumandcode/net-core-2-why-xunit-and-not-nunit-or-mstest–aei

I needed to run unit tests and the User.Identity needed to be mocked, but some of the methods being called are extension methods, like GetUserId defined in Microsoft.AspNet.Identity.Core.dll.

namespace Microsoft.AspNet.Identity
{
    public static class IdentityExtensions
    {
        public static string FindFirstValue(this ClaimsIdentity identity, string claimType);
        public static T GetUserId<T>(this IIdentity identity) where T : IConvertible;
        public static string GetUserId(this IIdentity identity);
        public static string GetUserName(this IIdentity identity);
    }
}

I learned that Moq can’t really mock extension methods because .

Using SpyIL we were able to decompile Microsoft.AspNet.Identity.Core.dll and saw that …

etc… until it wokred.

Fake it:

using (var fake = new FakeHttpContext.FakeHttpContext())
{
    OrganizationClassController organizationClassController = new OrganizationClassController(/* ... */);

    var data = new Dictionary<string, object>()
    {
        {"a", "b"} // fake whatever  you need here.
    };

    var identityMock = new Mock<ClaimsIdentity>();
    identityMock.Setup(p => p.FindFirst(It.IsAny<string>())).Returns(new Claim("foo", "someid"));

    var userMock = new Mock<IPrincipal>();
    userMock.Setup(p => p.IsInRole("Organization")).Returns(true);
    userMock.SetupGet(p => p.Identity).Returns(identityMock.Object);

    var userMock3 = userMock.Object.Identity;
    var asldkfj = userMock3.GetUserId();

    var contextMock = new Mock<HttpContextBase>();
    contextMock.SetupGet(ctx => ctx.User)
               .Returns(userMock.Object);

    var controllerContextMock = new Mock<System.Web.Mvc.ControllerContext>();
    controllerContextMock.SetupGet(con => con.HttpContext)
                         .Returns(contextMock.Object);

    organizationClassController.ControllerContext = controllerContextMock.Object;

    HttpContext.Current.Items.Add("owin.Environment", data);

    var task = organizationClassController.SaveClass(organizationClass);
    task.Wait();

}

Use it:

string userId = User.Identity.GetUserId();

In an extension method:

    public static bool IsOrganization(this IPrincipal principal)
    {
        return principal.IsInRole(Role.Organization);
    }

Notes: http://adventuresdotnet.blogspot.com/2011/03/mocking-static-methods-for-unit-testing.html http://unittesting1.blogspot.com/2016/07/how-to-mock-owincontext-for-mvc-5.html https://blog.jcorioland.io/archives/2014/04/01/using-owin-to-test-your-web-api-controllers.html https://docs.microsoft.com/en-us/previous-versions/aspnet/mt174927(v=vs.118) https://github.com/Shazwazza/UmbracoIdentity/issues/46 https://stackoverflow.com/questions/21768767/why-am-i-getting-an-exception-with-the-message-invalid-setup-on-a-non-virtual https://stackoverflow.com/questions/2295960/mocking-extension-methods-with-moq https://stackoverflow.com/questions/24836845/request-getowincontext-returns-null-within-unit-test-how-do-i-test-owin-authen https://stackoverflow.com/questions/26347582/httpcontext-getowincontext-getusermanagerapprolemanager-return-null https://stackoverflow.com/questions/29759672/asp-net-mvc-no-owin-environment-item-was-found-in-the-context https://stackoverflow.com/questions/38170467/httpcontext-current-is-null-when-unit-test https://stackoverflow.com/questions/4379450/mock-httpcontext-current-in-test-init-method https://stackoverflow.com/questions/47014168/mock-session-object-with-custom-extension-method https://stackoverflow.com/questions/758066/how-to-mock-controller-user-using-moq