How to test your fixie customizations

[rick-de-water]

So I made some parameter attributes, such as NumberRangeAttribute, that tell the IExecution to generate parameters and run the test multiple times.

Now I want to write tests for my custom IExecution implementation to make sure that it works correctly. I looked at the source code a bit, but it seems like most required classes are internal. I'm not allowed to create a custom TestSuite to pass to my custom IExecution for example, since the constructor is internal.

How would you recommend I test my tests?