Writing Unit Test for methods that use User.Identity.Name in ASP.NET Web API

The below one is only one way of doing this:

public class FooController : ApiController {    public string Get() {        return User.Identity.Name;    }}public class FooTest {    [Fact]    public void Foo() {        var identity = new GenericIdentity("tugberk");        Thread.CurrentPrincipal = new GenericPrincipal(identity, null);        var controller = new FooController();        Assert.Equal(controller.Get(), identity.Name);    }}

Here's another way I found in the NerdDinner testing tutorial. It worked in my case:

DinnersController CreateDinnersControllerAs(string userName){    var mock = new Mock<ControllerContext>();    mock.SetupGet(p => p.HttpContext.User.Identity.Name).Returns(userName);    mock.SetupGet(p => p.HttpContext.Request.IsAuthenticated).Returns(true);    var controller = CreateDinnersController();    controller.ControllerContext = mock.Object;    return controller;}[TestMethod]public void EditAction_Should_Return_EditView_When_ValidOwner(){    // Arrange    var controller = CreateDinnersControllerAs("SomeUser");    // Act    var result = controller.Edit(1) as ViewResult;    // Assert    Assert.IsInstanceOfType(result.ViewData.Model, typeof(DinnerFormViewModel));}

Make sure you read the full section: Mocking the User.Identity.Name property

It uses the Moq mocking framework that you can install in your Test project using NuGet: http://nuget.org/packages/moq

With WebApi 5.0 this is slightly different. You can now do:

controller.User = new ClaimsPrincipal(  new GenericPrincipal(new GenericIdentity("user"), null));