run-tests: implement Test._testMethodName...
run-tests: implement Test._testMethodName
This methods is needed internally by utilities like __repr__. I do not see any
harm in having it declared. Any actual attempt to use it to call a test would
crash, but at least random debug print in the test runner will no longer crash.
Another approach would have been to redefine the __repr__ function, but I think
it a good thing to have some respect for the base class API.