def METHOD_NAME():
    df = read_csv_and_index_fips_date(
        "city,county,state,fips,country,aggregate_level,date,metric\n"
        "Smithville,,ZZ,97123,USA,city,2020-03-23,smithville-march23\n"
        ",North County,ZZ,97001,USA,county,2020-03-23,county-metric\n"
        ",Unknown County,ZZ,97999,USA,county,2020-03-23,unknown-county\n"
        ",,ZZ,97,USA,state,2020-03-23,mystate\n"
        ",,,,UK,country,2020-03-23,foo\n"
    ).reset_index()
    assert column_as_set(df, "metric", AggregationLevel.COUNTY) == {
        "county-metric",
        "unknown-county",
    }
    assert column_as_set(df, "metric", AggregationLevel.COUNTY, exclude_county_999=True) == {
        "county-metric"
    }
    assert column_as_set(df, "metric", None, exclude_county_999=True) == {
        "smithville-march23",
        "county-metric",
        "mystate",
        "foo",
    }