code: def test_operator(self, mock_opsgenie_hook):
      mock_opsgenie_hook.return_value = mock.Mock()
      mock_opsgenie_hook.return_value.delete_alert.return_value = True
  
      operator = OpsgenieDeleteAlertOperator(
          task_id="opsgenie_test_delete_job",
          dag=self.dag,
          identifier="id",
          identifier_type="id",
          user="name",
          source="source",
      )
      operator.execute(None)
      mock_opsgenie_hook.assert_called_once_with("opsgenie_default")
      mock_opsgenie_hook.return_value.delete_alert.assert_called_once_with(
          identifier="id",
          identifier_type="id",
          source="source",
          user="name",
      )
  
file_path: airflow/tests/providers/opsgenie/operators/test_opsgenie.py
imports: from __future__ import annotations
  from unittest import mock
  from airflow.models.dag import DAG
  from airflow.providers.opsgenie.operators.opsgenie import OpsgenieCloseAlertOperator, OpsgenieCreateAlertOperator, OpsgenieDeleteAlertOperator
  from airflow.utils import timezone
label_desc: Use image node_id 2 for calling the TestOpsgenieDeleteAlertOperator obj's underlying member method code with example usage: obj.test_operator(mock_opsgenie_hook) without return types