好的，这是我在测试类中的代码:-(NSManagedObjectContext*)managedObjectContextWithConcurrencyType:(NSManagedObjectContextConcurrencyType)concurrencyType{NSManagedObjectModel*mom=[NSManagedObjectModelmergedModelFromBundles:nil];STAssertNotNil(mom,@"CannotcreateMOMfrommainbundle");NSPersistentStoreCoordinator*psc=