code: def test_get_spec(app, spec_format):
      spec = app._get_spec(spec_format)
  
      if spec_format == "json":
          assert isinstance(spec, dict)
      else:
          assert "title: APIFlask" in spec
  
imports: import json
  import pytest
  from flask import request
  from openapi_spec_validator import validate_spec
  from .schemas import Bar
  from .schemas import Baz
  from .schemas import Foo
  from apiflask import APIBlueprint
  from apiflask import Schema
  from apiflask.commands import spec_command
  from apiflask.fields import Integer
label_desc: Use image node_id 4 for calling a global function with example usage: test_get_spec(app, spec_format) without return types