def METHOD_NAME(self):
    """Test get_data_shape on strings and collections of strings."""
    res = get_data_shape('abc')
    self.assertIsNone(res)
    res = get_data_shape(('a', 'b'))
    self.assertTupleEqual(res, (2, ))
    res = get_data_shape((('a', 'b'), ('c', 'd'), ('e', 'f')))
    self.assertTupleEqual(res, (3, 2))