def METHOD_NAME(self):
    self.assertTrue(PollingStation.objects.filter(council_id="FOO").exists())
    self.assertTrue(PollingDistrict.objects.filter(council_id="FOO").exists())
    self.assertTrue(
        UprnToCouncil.objects.filter(lad="E000001")
        .exclude(polling_station_id="")
        .exists()
    )
    delete_council_data("FOO")
    self.assertFalse(PollingStation.objects.filter(council_id="FOO").exists())
    self.assertFalse(PollingDistrict.objects.filter(council_id="FOO").exists())
    self.assertFalse(
        UprnToCouncil.objects.filter(lad="E000001")
        .exclude(polling_station_id="")
        .exists()
    )