code: def test_simple_tags(app, client):
      assert app.tags is None
      app.tags = ["foo", "bar", "baz"]
  
      rv = client.get("/openapi.json")
      assert rv.status_code == 200
      validate_spec(rv.json)
      assert rv.json["tags"]
      assert {"name": "foo"} in rv.json["tags"]
      assert {"name": "bar"} in rv.json["tags"]
      assert {"name": "baz"} in rv.json["tags"]
  
file_path: apiflask/tests/test_openapi_tags.py
imports: import importlib
  import pytest
  from openapi_spec_validator import validate_spec
  from apiflask import APIBlueprint
label_desc: Use image node_id 2 for calling a global function with example usage: test_simple_tags(app, client) without return types