How to mock Controller.User using moq

Question

I have a couple of ActionMethods that queries the Controller.User for its role like this

bool isAdmin = User.IsInRole(\"admin\");

acting co

Answer 1

You need to Mock the ControllerContext, HttpContextBase and finally IPrincipal to mock the user property on Controller. Using Moq (v2) something along the following lines should work.

    [TestMethod]
    public void HomeControllerReturnsIndexViewWhenUserIsAdmin() {
        var homeController = new HomeController();

        var userMock = new Mock();
        userMock.Expect(p => p.IsInRole("admin")).Returns(true);

        var contextMock = new Mock();
        contextMock.ExpectGet(ctx => ctx.User)
                   .Returns(userMock.Object);

        var controllerContextMock = new Mock();
        controllerContextMock.ExpectGet(con => con.HttpContext)
                             .Returns(contextMock.Object);

        homeController.ControllerContext = controllerContextMock.Object;
        var result = homeController.Index();
        userMock.Verify(p => p.IsInRole("admin"));
        Assert.AreEqual(((ViewResult)result).ViewName, "Index");
    }

Testing the behaviour when the user isn't an admin is as simple as changing the expectation set on the userMock object to return false.