code: def test_get_sqlalchemy_engine(self, get_client):
      self.spanner_hook_default_project_id._get_conn_params = MagicMock(
          return_value=SPANNER_CONN_PARAMS
      )
      engine = (
          self.spanner_hook_default_project_id.get_sqlalchemy_engine()
      )
      assert isinstance(engine, sqlalchemy.engine.Engine)
      assert engine.name == "spanner+spanner"
  
imports: from __future__ import annotations
  from unittest import mock
  from unittest.mock import MagicMock, PropertyMock
  import pytest
  import sqlalchemy
  from airflow.providers.google.cloud.hooks.spanner import SpannerHook
  from airflow.providers.google.common.consts import CLIENT_INFO
  from tests.providers.google.cloud.utils.base_gcp_mock import GCP_PROJECT_ID_HOOK_UNIT_TEST, mock_base_gcp_hook_default_project_id, mock_base_gcp_hook_no_default_project_id
label_desc: Use image node_id 23 for calling the TestGcpSpannerHookDefaultProjectId obj's underlying member method code with example usage: obj.test_get_sqlalchemy_engine(get_client) without return types