'Tickets Validate Date - Tests if exception is raised when sales_ends_at is before sales_starts_at
:return:'

def test_date_start_gt_end(self):

    schema = TicketSchema()
    original_data = {'data': {}}
    data = {'sales_starts_at': datetime(2003, 9, 4, 12, 30, 45).replace(tzinfo=timezone('UTC')), 'sales_ends_at': datetime(2003, 8, 4, 12, 30, 45).replace(tzinfo=timezone('UTC'))}
    with self.assertRaises(UnprocessableEntity):
        TicketSchema.validate_date(schema, data, original_data)
