old_contents: SECRET_KEY = 'abc'
  
  INSTALLED_APPS = [
      'argcache',
      'tests',
  ]
  
new_contents: import os
  TESTS_DIR = os.path.dirname(__file__)
  
  SECRET_KEY = 'abc'
  
  INSTALLED_APPS = [
      'argcache',
      'tests',
  ]
  
  DATABASES = {
      'default': {
          'ENGINE': 'django.db.backends.sqlite3',
          'NAME': os.path.join(TESTS_DIR, 'db.sqlite3'),
      }
  }
  
subject: Add database settings to tests/settings.py