core data setup for xcode5 unit testing (iOS)

gistfile1.txt

@interface StoreViewControllerTest : XCTestCase

@end

@implementation StoreViewControllerTest {
    NSManagedObjectContext* _moc;
    StoreViewController* _storeController;
}

- (void)setUp {

 [super setUp];

  // CoreData stack
  NSURL *modelURL = [[NSBundle mainBundle] URLForResource:@"dataModel" withExtension:@"momd"];
  NSManagedObjectModel* mom = [[NSManagedObjectModel alloc] initWithContentsOfURL:modelURL];
  NSPersistentStoreCoordinator *psc = [[NSPersistentStoreCoordinator alloc] initWithManagedObjectModel:mom];
  XCTAssert([psc addPersistentStoreWithType:NSInMemoryStoreType configuration:nil URL:nil options:nil error:NULL] ? YES : NO, @"Should be able to add in-memory store");
  _moc = [[NSManagedObjectContext alloc] init];
  _moc.persistentStoreCoordinator = psc;
    
  // storyboard stack
  _storeController = [[UIStoryboard storyboardWithName:@"MainStoryboard" bundle:nil] instantiateViewControllerWithIdentifier:@"store"];
  _storeController.store = [NSEntityDescription insertNewObjectForEntityForName:@"Store" inManagedObjectContext:_moc];
  _storeController.managedObjectContext = _moc;

}


- (void)tearDown {
    // Put teardown code here. This method is called after the invocation of each test method in the class.
    [super tearDown];
    _storeController = nil;
    _moc = nil;
}

- (void)testAddItem {
  int starting_products_count = _storeController.store.products.count;

  Product* newProduct = [NSEntityDescription insertNewObjectForEntityForName:@"Product" inManagedObjectContext:_moc];
  [_storeController addProduct:newProduct];

  XCTAssert(_storeController.store.products.count == starting_products_count+1, @"store count should increase by 1 to %d, instead got %d", starting_products_count+1, _storeController.store.products.count);

}