def METHOD_NAME(*args):
    """ Mock out calls to our BQ for population merge dfs """
    _dataset, requested_table_name, _dtype = args
    return pd.read_csv(os.path.join(TEST_DIR,
                                    'mock_population_tables',
                                    f'{requested_table_name}.csv'),
                       dtype={"state_fips": str, "county_fips": str})