def test_no_selected_tickets(self):
        self.req.args = {'selected_tickets': ''}
        batch = BatchModifyModule(self.env)
        selected_tickets = batch._get_selected_tickets(self.req)
        self.assertEqual(selected_tickets, [])

    # Assign list items
If nothing is selected, the return value is the empty list.
dataset/ETHPy150Open edgewall/trac/trac/ticket/tests/batch.py/BatchModifyTestCase.test_no_selected_tickets