How do I unit test a controller action that uses ther Controller.User variable?

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轮回少年
轮回少年 2021-02-20 09:43

I have a controller action that automatically redirects to a new page if the user is already logged in (User.Identity.IsAuthenticated). What is the best way to writ

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  • 2021-02-20 10:31

    I've been using the following Mocks with Moq to allow setting up various conditions in my unit tests. First, the HttpContextBase mock:

        public static Mock<HttpContextBase> GetHttpContextMock(bool isLoggedIn)
        {
            var context = new Mock<HttpContextBase>();
            var request = new Mock<HttpRequestBase>();
            var response = new Mock<HttpResponseBase>();
            var session = new Mock<HttpSessionStateBase>();
            var server = new Mock<HttpServerUtilityBase>();
            var principal = AuthenticationAndAuthorization.GetPrincipleMock(isLoggedIn);
    
            context.SetupGet(c => c.Request).Returns(request.Object);
            context.SetupGet(c => c.Response).Returns(response.Object);
            context.SetupGet(c => c.Session).Returns(session.Object);
            context.SetupGet(c => c.Server).Returns(server.Object);
            context.SetupGet(c => c.User).Returns(principal.Object);
    
            return context;
        }
    

    Every property that might provide a useful Mock is set up in here. That way, if I need to add something like a referrer, I can just use:

    Mock.Get(controller.Request).Setup(s => s.UrlReferrer).Returns(new Uri("http://blah.com/");
    

    The "GetPrincipleMock" method is what sets up the user. It looks like this:

        public static Mock<IPrincipal> GetPrincipleMock(bool isLoggedIn)
        {
            var mock = new Mock<IPrincipal>();
    
            mock.SetupGet(i => i.Identity).Returns(GetIdentityMock(isLoggedIn).Object);
            mock.Setup(i => i.IsInRole(It.IsAny<string>())).Returns(false);
    
            return mock;
        }
    
        public static Mock<IIdentity> GetIdentityMock(bool isLoggedIn)
        {
            var mock = new Mock<IIdentity>();
    
            mock.SetupGet(i => i.AuthenticationType).Returns(isLoggedIn ? "Mock Identity" : null);
            mock.SetupGet(i => i.IsAuthenticated).Returns(isLoggedIn);
            mock.SetupGet(i => i.Name).Returns(isLoggedIn ? "testuser" : null);
    
            return mock;
        }
    

    Now, my controller setups in the tests look like this:

    var controller = new ProductController();
    var httpContext = GetHttpContextMock(true); //logged in, set to false to not be logged in
    
    ControllerContext controllerContext = new ControllerContext(httpContext.Object, new RouteData(), controller);
    controller.ControllerContext = controllerContext;
    

    It's a little bit of verbose setup, but once you have everything in place, testing a variety of conditions becomes a lot easier.

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  • 2021-02-20 10:37

    That's not the simplest thing to do, but it can be done. The User property simply delegates to Controller.HttpContext.User. Both are non-virtual read-only properties, so you can't do anything about them. However, Controller.HttpContext delegates to ControllerBase.ControllerContext which is a writable property.

    Therefore, you can assign a Test Double HttpContextBase to Controller.ControllerContext before exercising your System Under Test (SUT). Using Moq, it would look something like this:

    var user = new GenericPrincipal(new GenericIdentity(string.Empty), null);
    var httpCtxStub = new Mock<HttpContextBase>();
    httpCtxStub.SetupGet(ctx => ctx.User).Returns(user);
    
    var controllerCtx = new ControllerContext();
    controllerCtx.HttpContext = httpCtxStub.Object;
    
    sut.ControllerContext = controllerCtx;
    

    Then invoke your action and verify that the return result is a RedirectResult.

    This test utilizes the implicit knowledge that when you create a GenericIdentity with an empty name, it will return false for IsAuthenticated. You could consider making the test more explicit by using a Mock<IIdentity> instead.

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