ASP.NET MVC Controller post method unit test: ModelState.IsValid always true

Question

I have written my first unit tests for an ASP.NET MVC web application. All works fine and it is giving me valuable information, but I can\'t test errors in the view model. T

Answer 1

I found this solution: SO: Validation does not work when I use Validator.TryValidateObject combined with the solution @Kenneth provided:

[TestMethod]
    public void test_validation()
    {
        var sut = new POSViewModel();
        // Set some properties here
        var context = new ValidationContext(sut, null, null);
        var results = new List();
        TypeDescriptor.AddProviderTransparent(new AssociatedMetadataTypeTypeDescriptionProvider(typeof(POSViewModel), typeof(POSViewModel)), typeof(POSViewModel));

        var isModelStateValid = Validator.TryValidateObject(sut, context, results, true);

        // Assert here
    }

If you have a class library with all you resources in, don't forget to reference it in your test project.