How do I mock controller context in my unit test so that my partial view to string function works?

Question

I am attempting to create a unit test for my controller, but the action I am testing uses a partial view to string function which doesn\'t want to work in my tests.

Answer 1

Here's a version using AutoMoq that renders a string of your choice.

Subject.ControllerContext = new ControllerContext(
    Mocked().Object,
    new RouteData(),
    Subject);

ViewEngines.Engines.Clear();
ViewEngines.Engines.Add(Mocked().Object);
Mocked()
    .Setup(x => x.FindPartialView(Subject.ControllerContext,
                                  It.IsAny(), It.IsAny()))
    .Returns(new ViewEngineResult(Mocked().Object,
                                  Mocked().Object));
Mocked()
    .Setup(x => x.Render(It.IsAny(), It.IsAny()))
    .Callback((ViewContext c, TextWriter w) => w.WriteLine("RENDERED"));