old_contents: DATABASES = {
      'default': {
          'ENGINE': 'django.db.backends.sqlite3',
          'NAME': 'django_d2m.db',
      }
  }
  
  MIDDLEWARE_CLASSES = (
      'django.middleware.locale.LocaleMiddleware',
      'django.middleware.common.CommonMiddleware',
      'django.middleware.csrf.CsrfViewMiddleware',
  )
  
  STATIC_URL = '/'
  SECRET_KEY = 'django_d2m'
  
  INSTALLED_APPS = (
      'django.contrib.staticfiles',
      'django_d2m.testapp',
  )
  
new_contents: DEBUG = True
  DATABASES = {
      'default': {
          'ENGINE': 'django.db.backends.sqlite3',
          'NAME': 'django_d2m.db',
      }
  }
  
  MIDDLEWARE_CLASSES = (
      'django.middleware.locale.LocaleMiddleware',
      'django.middleware.common.CommonMiddleware',
      'django.middleware.csrf.CsrfViewMiddleware',
  )
  
  STATIC_URL = '/'
  SECRET_KEY = 'django_d2m'
  
  INSTALLED_APPS = (
      'django.contrib.staticfiles',
      'django_d2m.testapp',
  )
  
subject: Update settings for testing