Playwright テストコード並列実行時のワーカー別ログ出力方法メモ

• Playwright+pytest-xdistで並列ブラウザアクセスした際のノード(ワーカー)別にログ出力する方法についてメモする。

コード

• test.py

  • Playwright公式サイトにアクセスし、title要素の確認を行う。
  • pytest-xdistワーカー別にログ出力を行う。

  from playwright.sync_api import Playwright
  import logging
  
  # ワーカー別ロガーを定義する
  def _get_logger(worker_id):
      logger = logging.getLogger("logger_{}".format(worker_id))    
      handler = logging.FileHandler(filename="test_{}.log".format(worker_id))  
      handler.setFormatter(logging.Formatter("%(asctime)s %(levelname)s %(message)s"))
      logger.setLevel(logging.INFO)  
      logger.addHandler(handler)
      return logger
  
  # `worker_id`にワーカープロセスIDが格納される
  def test_parallel(playwright: Playwright,worker_id):
      browser = playwright.chromium.launch(headless=True)
      page = browser.new_page()
      # ページアクセス＋タイトルチェック
      page.goto('https://playwright.dev/python/')
      assert page.title() == 'Fast and reliable end-to-end testing for modern web apps | Playwright Python'
  
      # ワーカー別ログファイルにログ出力を行う
      # ワーカープロセスID,URL,タイトル
      logger = _get_logger(worker_id)
      logger.info('worker:{}  url:{}  title:{}'.format(worker_id,page.url, page.title()))
      page.close()
  
  

動作確認

• 以下のコマンドを実行する

  pytest -n 3 --dist each test.py
  ===================================================== test session starts =====================================================
  platform linux -- Python 3.8.10, pytest-7.2.0, pluggy-1.0.0
  rootdir: /home/u5008506/dev/playwright-test
  plugins: html-3.2.0, playwright-0.3.0, metadata-2.0.4, cov-4.0.0, base-url-2.0.0, xdist-3.1.0, parallel-0.1.1, anyio-3.3.4
  gw0 [1] / gw1 [1] / gw2 [1]
  ...                                                                                                                     [100%] [100%] [100%]
  ====================================================== 3 passed in 9.98s ======================================================
  

  以下のように、test_{worker_id}.logファイルにログ出力が行われる

• test_gw0.log

  2023-01-09 10:50:45,884 INFO worker:gw0  url:https://playwright.dev/python/  title:Fast and reliable end-to-end testing for modern web apps | Playwright Python
  

• test_gw1.log

  2023-01-09 10:50:45,898 INFO worker:gw1  url:https://playwright.dev/python/  title:Fast and reliable end-to-end testing for modern web apps | Playwright Python
  

• test_gw2.log

  2023-01-09 10:50:46,002 INFO worker:gw2  url:https://playwright.dev/python/  title:Fast and reliable end-to-end testing for modern web apps | Playwright Python
  

参考情報

• Identifying the worker process during a test