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

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

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);
    }
}