old_contents: /*
   * Storage Class is a interface to create storage with the following contracts
   * lint comment is applied to prevent `class-method-use-this` for this case
   */
  
  /* eslint class-methods-use-this: [
       'error', { "exceptMethods": ['ping', 'listNamespaces', 'postCode', 'putCode', 'getCode',
                                    'deleteCode', 'getCodeByCache', 'putCodeEnviromentVariable',
                                    'deleteCodeEnviromentVariable',
                                    ]
     }]
  */
  
  const ERR_UNIMPLEMENTED_METHOD = new Error('unimplemented method for Storage interface');
  
  class Storage {
    constructor(name) {
      this.name = name;
    }
  
    ping() { throw ERR_UNIMPLEMENTED_METHOD; }
    listNamespaces() { throw ERR_UNIMPLEMENTED_METHOD; }
    postCode() { throw ERR_UNIMPLEMENTED_METHOD; }
    putCode() { throw ERR_UNIMPLEMENTED_METHOD; }
    getCode() { throw ERR_UNIMPLEMENTED_METHOD; }
    deleteCode() { throw ERR_UNIMPLEMENTED_METHOD; }
    getCodeByCache() { throw ERR_UNIMPLEMENTED_METHOD; }
    putCodeEnviromentVariable() { throw ERR_UNIMPLEMENTED_METHOD; }
    deleteCodeEnviromentVariable() { throw ERR_UNIMPLEMENTED_METHOD; }
  }
  
  module.exports = Storage;
  
new_contents: /*
   * Storage Class is a interface to create storage with the following contracts
   * lint comment is applied to prevent `class-method-use-this` for this case
   */
  
  /* eslint class-methods-use-this: [
       'error', { "exceptMethods": ['ping', 'listNamespaces', 'postCode', 'putCode', 'getCode',
                                    'deleteCode', 'getCodeByCache', 'putCodeEnviromentVariable',
                                    'deleteCodeEnviromentVariable',
                                    ]
     }]
  */
  
  const ERR_UNIMPLEMENTED_METHOD = new Error('unimplemented method for Storage interface');
  
  class Storage {
    constructor(name) {
      this.name = name;
    }
  
    ping() { throw ERR_UNIMPLEMENTED_METHOD; }
    listNamespaces() { throw ERR_UNIMPLEMENTED_METHOD; }
    postCode() { throw ERR_UNIMPLEMENTED_METHOD; }
    putCode() { throw ERR_UNIMPLEMENTED_METHOD; }
    getCode() { throw ERR_UNIMPLEMENTED_METHOD; }
    deleteCode() { throw ERR_UNIMPLEMENTED_METHOD; }
    getCodeByCache() { throw ERR_UNIMPLEMENTED_METHOD; }
    getCodesByCache() { throw ERR_UNIMPLEMENTED_METHOD; }
    putCodeEnviromentVariable() { throw ERR_UNIMPLEMENTED_METHOD; }
    deleteCodeEnviromentVariable() { throw ERR_UNIMPLEMENTED_METHOD; }
  }
  
  module.exports = Storage;
  
subject: Add missing method on interface