code: def test_database_delete_missing_project_id(self, mock_hook):
      mock_hook.return_value.get_database.return_value = {"name": DB_ID}
      op = SpannerDeleteDatabaseInstanceOperator(
          instance_id=INSTANCE_ID, database_id=DB_ID, task_id="id"
      )
      result = op.execute(None)
      mock_hook.assert_called_once_with(
          gcp_conn_id="google_cloud_default",
          impersonation_chain=None,
      )
      mock_hook.return_value.delete_database.assert_called_once_with(
          project_id=None, instance_id=INSTANCE_ID, database_id=DB_ID
      )
      assert result
  
imports: from __future__ import annotations
  from unittest import mock
  import pytest
  from airflow.exceptions import AirflowException
  from airflow.providers.google.cloud.operators.spanner import SpannerDeleteDatabaseInstanceOperator, SpannerDeleteInstanceOperator, SpannerDeployDatabaseInstanceOperator, SpannerDeployInstanceOperator, SpannerQueryDatabaseInstanceOperator, SpannerUpdateDatabaseInstanceOperator
label_desc: Use image node_id 25 for calling the TestCloudSpanner obj's underlying member method code with example usage: obj.test_database_delete_missing_project_id(mock_hook) without return types