old_contents: tests_settings_file = os.path.join(os.path.dirname(__file__), 'env_tests.py')
  with open(tests_settings_file, 'r') as f:
      exec(f.read())
  
  TREKKING_TOPOLOGY_ENABLED = False
  CELERY_ALWAYS_EAGER = True
  
new_contents: tests_settings_file = os.path.join(os.path.dirname(__file__), 'env_tests.py')
  with open(tests_settings_file, 'r') as f:
      exec(f.read())
  
  TREKKING_TOPOLOGY_ENABLED = False
  
subject: remove already defined CELERY_ALWAYS_EAGER