Not failing when wrong method called by super

[dobey]

In the txcheck tests to ensure that super is being called, yielded, and inlineCallbacks used for twisted TestCase base tests, it is not checking that the super() call is actually calling the right parent method. This results in some very weird behavior when it happens, as for example calling __init__() from the super in setUp instead of setUp, will result in all tests passing, and not actually executing.