code: def client(app):
      """A test client for the app."""
      return app.test_client()
  
file_path: flask/examples/tutorial/tests/conftest.py
imports: import os
  import tempfile
  import pytest
  from flaskr import create_app
  from flaskr.db import get_db
  from flaskr.db import init_db
label_desc: Use image node_id 2 for calling a global function with example usage: client(app) and returns: app