Błąd konsolidatora Apple Mach-O podczas używania klas Core Data w OCUnit

- (NSManagedObjectContext*)managedObjectContextWithConcurrencyType:(NSManagedObjectContextConcurrencyType)concurrencyType {

 NSManagedObjectModel *mom = [NSManagedObjectModel mergedModelFromBundles:nil];

 STAssertNotNil(mom, @"Can not create MOM from main bundle"); NSPersistentStoreCoordinator *psc = [[NSPersistentStoreCoordinator alloc] initWithManagedObjectModel:mom];

 STAssertNotNil(psc, @"Can not create persistent store coordinator");

 NSPersistentStore *store = [psc addPersistentStoreWithType:NSInMemoryStoreType configuration:nil URL:nil options:nil error:0];

 STAssertNotNil(store, @"Can not create In-Memory persistent store"); NSManagedObjectContext *moc = [[NSManagedObjectContext alloc] initWithConcurrencyType:concurrencyType];

 moc.persistentStoreCoordinator = psc; return moc;

}

Undefined symbols for architecture i386:

 "_NSInMemoryStoreType", referenced from:

 -[CrosswordItemTests managedObjectContextWithConcurrencyType:] in CrosswordItemTests.o

 "_OBJC_CLASS_$_NSEntityDescription", referenced from:

 objc-class-ref in CrosswordItemTests.o

 "_OBJC_CLASS_$_NSManagedObjectContext", referenced from:

 objc-class-ref in CrosswordItemTests.o

 "_OBJC_CLASS_$_NSManagedObjectModel", referenced from:

 objc-class-ref in CrosswordItemTests.o

 "_OBJC_CLASS_$_NSPersistentStoreCoordinator", referenced from:

 objc-class-ref in CrosswordItemTests.o

ld: symbol(s) not found for architecture i386

clang: error: linker command failed with exit code 1 (use -v to see invocation)

#import <CoreData/CoreData.h>