Question

I’ve written some custom model binders (implementing IModelBinder) in our ASP.NET MVC application. I’m wondering what is a good approach to unittest them (binders)?

Answer 1

I did it this way:

var formElements = new NameValueCollection() { {'FirstName','Bubba'}, {'MiddleName', ''}, {'LastName', 'Gump'} };          var fakeController = GetControllerContext(formElements); var valueProvider = new Mock<IValueProvider>();             var bindingContext = new ModelBindingContext(fakeController, valueProvider.Object, typeof(Guid), null, null, null, null);    private static ControllerContext GetControllerContext(NameValueCollection form) {     Mock<HttpRequestBase> mockRequest = new Mock<HttpRequestBase>();     mockRequest.Expect(r => r.Form).Returns(form);      Mock<HttpContextBase> mockHttpContext = new Mock<HttpContextBase>();     mockHttpContext.Expect(c => c.Request).Returns(mockRequest.Object);      return new ControllerContext(mockHttpContext.Object, new RouteData(), new Mock<ControllerBase>().Object); } 

And then I just passed in the bindingContext variable to the BindModel method of the object that implements the IModelBinder interface.