How to mock Controller.User using moq
I have a couple of ActionMethods that queries the Controller.User for its role like this
bool isAdmin = User.IsInRole("admin");
acting conveniently on that condition.
I'm starting to make tests for these methods with code like this
[TestMethod]
public void HomeController_Index_Should_Return_Non_Null_ViewPage()
{
HomeController controller = new HomePostController();
ActionResult index = controller.Index();
Assert.IsNotNull(index);
}
and that Test Fails because Controller.User is not set. Any idea?
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<IPrincipal>();
userMock.Expect(p => p.IsInRole("admin")).Returns(true);
var contextMock = new Mock<HttpContextBase>();
contextMock.ExpectGet(ctx => ctx.User)
.Returns(userMock.Object);
var controllerContextMock = new Mock<ControllerContext>();
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.
Using Moq version 3.1 (and NUnit):
[Test]
public void HomeController_Index_Should_Return_Non_Null_ViewPage()
{
// Assign:
var homeController = new HomeController();
Mock<ControllerContext> controllerContextMock = new Mock<ControllerContext>();
controllerContextMock.Setup(
x => x.HttpContext.User.IsInRole(It.Is<string>(s => s.Equals("admin")))
).Returns(true);
homeController.ControllerContext = controllerContextMock.Object;
// Act:
ActionResult index = homeController.Index();
// Assert:
Assert.IsNotNull(index);
// Place other asserts here...
controllerContextMock.Verify(
x => x.HttpContext.User.IsInRole(It.Is<string>(s => s.Equals("admin"))),
Times.Exactly(1),
"Must check if user is in role 'admin'");
}
Notice that there is no need to create mock for HttpContext, Moq supports nesting of properties when setting up the test.
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