def _assert_subset(self, expected_subset, actual_set):
    self.assertTrue(actual_set.issuperset(expected_subset), msg=('%s is not a superset of %s.' % (actual_set, expected_subset)))
def _assert_subset(self, expected_subset, actual_set):
    self.assertTrue(actual_set.issuperset(expected_subset), msg=('%s is not a superset of %s.' % (actual_set, expected_subset)))