现在我正在使用 Core Data，如何对我的模型进行单元测试? [英] How to unit test my models now that I am using Core Data?

问题描述

我一直在使用域模型开发 iphone 应用程序，并且一直推迟应用程序的持久性方面直到现在.Core Data 看起来是一个非常好的解决方案，因为我已经有了一个明确定义的模型，但是我在现有的单元测试中遇到了障碍.

I have been developing an iphone application using a domain model, and have put off the persistence aspect of the app until now. Core Data looks like a really good solution since I already have a well defined model but I am running into a snag with my existing unit tests.

这是我现在拥有的简单示例:

Here is simple example of what I have now:

- (void)test_full_name_returns_correct_string {
    Patient *patient = [[Patient alloc] init];  
    patient.firstName = @"charlie";
    patient.lastName = @"chaplin";
    STAssertTrue([[patient fullName] isEqualToString:@"charlie chaplin"], @"should have matched full name");
}  

一旦我的 Patient 对象从 NSManagedObject 扩展并使用 @dynamic 作为 firstName 和 lastName 属性，我该如何进行这项工作?

How can I make this work once my Patient object extends from NSManagedObject and uses @dynamic for the firstName and lastName properties?

有没有其他人在 Core Data 上遇到过这种情况?谢谢.

Has anyone else run into this type of this with Core Data? Thanks.

推荐答案

您需要在每个方法中或在 -setUp 中构建一个 Core Data 堆栈，然后将其拆除.使用 NSInMemoryPersistentStore 将使您的单元测试保持快速和内存中.将 @property (nonatomic,retain) NSManagedObjectContext *moc 添加到您的 TestCase 子类.然后:

You need to build a Core Data stack, either within each method or in -setUp and then tear it down. Using an NSInMemoryPersistentStore will keep things fast and in-memory for your unit tests. Add a @property (nonatomic,retain) NSManagedObjectContext *moc to your TestCase subclass. Then:

- (void)setUp {
  NSManagedObjectModel *mom = [NSManagedObjectModel mergedModelFromBundles:[NSArray arrayWithObject:bundleContainingXCDataModel]];
  NSPersistentStoreCoordinator *psc = [[NSPersistentStoreCoordinator alloc] initWithManagedObjectModel:mom];
  STAssertTrue([psc addPersistentStoreWithType:NSInMemoryStoreType configuration:nil URL:nil options:nil error:NULL] ? YES : NO, @"Should be able to add in-memory store");    
  self.moc = [[NSManagedObjectContext alloc] init];
  self.moc.persistentStoreCoordinator = psc;

  [mom release];
  [psc release];

}

- (void)tearDown {
  self.moc = nil;
}

您的测试方法如下所示:

Your test method then looks like:

- (void)test_full_name_returns_correct_string {
    Patient *patient = [NSEntityDescription insertNewObjectForEntityForName:@"Person" inManagedObjectContext:self.moc];

    patient.firstName = @"charlie";
    patient.lastName = @"chaplin";
    STAssertTrue([[patient fullName] isEqualToString:@"charlie chaplin"], @"should have matched full name");
}

假设您的实体名为 Person.顺便说一下，您的方法版本中存在内存泄漏；患者应该在非核心数据版本中-release(insertNewObjectForEntityForName:managedObjectContext: 返回一个自动发布的实例).

assuming your entity is named Person. There was a memory leak in your version of the method, by the way; patient should be -release'd in the non-Core Data version (insertNewObjectForEntityForName:managedObjectContext: returns an autoreleased instance).

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