old_contents: import os
  
  
  class Config(object):
      ''' Default Config Object '''
      DEBUG = False
      TESTING = False
      PORT = int(os.environ.get('PORT', 5000))
  
      @staticmethod
      def init_app(app):
          pass
  
  
  class ProductionConfig(Config):
      '''Production Config Object'''
      pass
  
  
  class DevelopmentConfig(Config):
      '''Development Config Object'''
      DEBUG = True
      MONGODB_SETTINGS = {'DB': "flask-jumpstart"}
  
  class TestingConfig(Config):
      '''Testing Config Object'''
      TESTING = True
  
  config = {
          'default': DevelopmentConfig,
          'production': ProductionConfig,
          'development': DevelopmentConfig,
          'testing': TestingConfig
          }
  
new_contents: import os
  
  
  class Config(object):
      ''' Default Config Object '''
      DEBUG = False
      TESTING = False
      PORT = int(os.environ.get('PORT', 5000))
  
      @staticmethod
      def init_app(app):
          pass
  
  
  class ProductionConfig(Config):
      '''Production Config Object'''
      pass
  
  
  class DevelopmentConfig(Config):
      '''Development Config Object'''
      DEBUG = True
      MONGODB_SETTINGS = {'DB': "flask-jumpstart"}
  
  class TestingConfig(Config):
      '''Testing Config Object'''
      TESTING = True
      MONGODB_SETTINGS = {'DB': "flask-jumpstart"}
  
  config = {
          'default': DevelopmentConfig,
          'production': ProductionConfig,
          'development': DevelopmentConfig,
          'testing': TestingConfig
          }
  
subject: Fix error in Testing config.