Monday, 7 September 2020

Unit test c#: Create Fake Httpcontext to bypass Null exception for User object

 Microsoft Visual studio Test Framework


Requirement: Nuget package Moq 4.13.0.0 (or later)

Settings in visual studio: Menu->Tools->Options ->Debugging->General
Tick "Use Managed Compatibility Mode"

Code: (copied from stackoverflow)
Step 1: 
Create a new class FakeHttpContext and paste the below code. Change the Returns value to whatever user name you need.

public static class FakeHttpContext
    {
        public static void SetFakeContext(this Controller controller)
        {

            var httpContext = MakeFakeContext();
            ControllerContext context =
            new ControllerContext(
            new RequestContext(httpContext,
            new RouteData()), controller);
            controller.ControllerContext = context;
        }


        private static HttpContextBase MakeFakeContext()
        {
            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 user = new Mock<IPrincipal>();
            var identity = new Mock<IIdentity>();

            context.Setup(c => c.Request).Returns(request.Object);
            context.Setup(c => c.Response).Returns(response.Object);
            context.Setup(c => c.Session).Returns(session.Object);
            context.Setup(c => c.Server).Returns(server.Object);
            context.Setup(c => c.User).Returns(user.Object);
            user.Setup(c => c.Identity).Returns(identity.Object);
            identity.Setup(i => i.IsAuthenticated).Returns(true);
            identity.Setup(i => i.Name).Returns("sanjeeb");

            return context.Object;
        }
    }


Step 2: 
Initialize the Fakehttpcontext in test initialize function. 

FakeHttpContext.SetFakeContext(usersController);



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Unit test c#: Create Fake Httpcontext to bypass Null exception for User object

  Microsoft Visual studio Test Framework Requirement: Nuget package Moq 4.13.0.0 (or later) Settings in visual studio: Menu->Tools->Op...