code: def test_db_url_environ(monkeypatch):
      """Test DATABASE_URL environment variable."""
      monkeypatch.setenv("DATABASE_URL", "sqlite:///environ")
      app = create_app()
      assert (
          app.config["SQLALCHEMY_DATABASE_URI"] == "sqlite:///environ"
      )
  
label_desc: Use image node_id 2 for calling a global function with example usage: test_db_url_environ(monkeypatch) without return types