def METHOD_NAME():
    # repo
    assert isinstance(issues_closed(10, 25430, period='year'), df_type)
    #repo_group
    assert isinstance(issues_closed(10, period='year'), df_type)
    # begin_date & end_date
    assert isinstance(issues_closed(10, 25430, period='week', begin_date='2019',
                                  end_date='2020-02'), df_type)
    assert isinstance(issues_closed(10, period='month', begin_date='2018-05',
                                  end_date='2019-08-15'), df_type)