测试的方法也很简单：

• 首先，在AppDelegate.h里面引用CoreDataHelper

  @property (strong, nonatomic, readonly)CoreDateHelper *coreDataHelper;

• 初始化CoreDataHelper

  - (CoreDateHelper*)cdh {
  
      if (debug == ) {
  
          NSLog(@"Running %@ '%@'",self.class, NSStringFromSelector(_cmd));
  
      }
  
      if (!_coreDataHelper) {
  
          _coreDataHelper = [CoreDateHelper new];
  
          [_coreDataHelper setupCoreData];
  
      }
  
      return _coreDataHelper;
  
  }

• 在程序转到后台或退出时保存

  [[self cdh] saveContext];