def METHOD_NAME(self, date_patch):
    date_patch.today.return_value = self.first_performance
    start_date, end_date = get_daterange_start_end_dates('thismonth')
    self.assertEqual(start_date, datetime.date(year=1829, month=8, day=1))
    self.assertEqual(end_date, datetime.date(year=1829, month=8, day=31))