code: def test_default_model_class_1x(app: Flask) -> None:
      db = SQLAlchemy(app)
  
      assert db.Model.query_class is db.Query
      assert db.Model.metadata is db.metadata
      assert issubclass(db.Model, Model)
      assert isinstance(db.Model, DefaultMeta)
  
imports: from __future__ import annotations
  import typing
  from datetime import datetime
  import pytest
  import sqlalchemy
  import sqlalchemy.exc
  import sqlalchemy.orm
  from flask import Flask
  from flask_sqlalchemy import SQLAlchemy
  from flask_sqlalchemy.model import DefaultMeta
  from flask_sqlalchemy.model import Model
label_desc: Use image node_id 1 for calling a global function with example usage: test_default_model_class_1x(app) without return types