code: def test_invalid_delta(self):
      exception_msg = "Wait. delta must be either datetime.timedelta or cron expression as str"
      with pytest.raises(Exception, match=exception_msg):
          dates.date_range(
              datetime(2016, 1, 1), datetime(2016, 1, 3), delta=1
          )
  
file_path: airflow/tests/utils/test_dates.py
imports: from __future__ import annotations
  from datetime import datetime, timedelta
  import pendulum
  import pytest
  from dateutil.relativedelta import relativedelta
  from airflow.utils import dates, timezone
label_desc: Use image node_id 4 for calling the TestUtilsDatesDateRange obj's underlying member method code with example usage: obj.test_invalid_delta() without return types