如何单元测试我的模型现在,我使用核心数据? [英] How to unit test my models now that I am using Core Data?
问题描述
我一直在使用领域模型开发一个iphone应用程序,并推迟了应用程序的持久化方面直到现在。 Core Data看起来像一个非常好的解决方案,因为我已经有一个定义良好的模型,但我遇到一个障碍与我现有的单元测试。
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.
这里是简单的例子我现在有:
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");
}
如果我的Patient对象从NSManagedObject扩展并使用@动态的firstName和lastName属性?
How can I make this work once my Patient object extends from NSManagedObject and uses @dynamic for the firstName and lastName properties?
有没有人在Core Data中运行这种类型?感谢。
Has anyone else run into this type of this with Core Data? Thanks.
推荐答案
您需要在每个方法或 -setUp
,然后将其撕下。使用 NSInMemoryPersistentStore
将保持快速和内存中的单元测试。向您的TestCase子类添加 @property(nonatomic,retain)NSManagedObjectContext * moc
。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:
- (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");
}
$ c>。在你的版本的方法中有一个内存泄漏,顺便说一下;病人应该在非核心数据版本( insertNewObjectForEntityForName:managedObjectContext:
返回一个自动释放的实例) -release
。
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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