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As suggested in the previous comment, here is simple code to find candidates for test duplication (TestCase subclasses subclassing other TestCase classes):
def find_dupes(mod):
 objects = [getattr(mod, name) for name in sorted(dir(mod))]
 classes = [obj for obj in objects if isinstance(obj, type) and
 issubclass(obj, unittest.TestCase)]
 for c in classes:
 for d in classes:
 if c is not d and issubclass(d, c):
 print("%s: %s < %s" % (mod.__name__, c.__name__, d.__name__))
Out of curiosity, I ran a modified form of this against all test modules to find which ones fit this pattern and *already* rely on unittest discovery (i.e. don't have test_main()). We might want to adjust these as well. There were four: test_asyncore, test_configparser, test_heapq, test_ipaddress