def METHOD_NAME(stats_mock):
    # tests that when you len() you get the len
    # of the stats data
    m_len = MagicMock()
    m_len.__len__.return_value = 23
    stats_mock.configure_mock(**{"return_value.data": m_len})
    tags_tool = TagsTool()
    assert len(tags_tool) == 23
    assert m_len.__len__.called