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As a follow up to my previous post, testing when ModelState is relatively simple, but leaves me feelings a little uneasy about my tests.

Here is an example tests, stripped down to remove some of the unnecessary bits

public class When_submitting_lead_data_that_is_in_an_invalid_state : Specification
{
    // class fields...etc

    protected override void Given()
    {
        base.Given();
        _mockOrdersRepository = MockRepository.GenerateStub<IOrdersRepository>();
        _checkoutController = new CheckoutController(_mockOrdersRepository);

        _leadDataWithEmptyPlanName = new PreCheckoutViewData();

        // add an error to the model state
        _checkoutController.ModelState.AddModelError("", "");

        _exceptionWasThrown = false;
    }

    protected override void When()
    {
        base.When();
        try
        {
            _checkoutController.Checkout(_leadDataWithEmptyPlanName);
        } catch(ArgumentNullException)
        {
            _exceptionWasThrown = true;
        }
    }

    [Then] public void an_exception_is_thrown()
    {
        _exceptionWasThrown.ShouldBe(true);
    }
}

This feels pretty loose to me, but there can be another tests that tests which states the model will appear invalid.