Test controller method with OCMock and master data

Question

I just understand TDD concepts and taunts, and I run into a problem in terms of correctness. I have a sheet that crashes and allows the user to create a new main data object and save it to the data store. I'm not sure that I am taking the best approach to testing it.

- (IBAction)add:(id)sender 
{  
  NSString *itemName = [self.itemNameTextField stringValue];
  SGItem *newItem = [NSEntityDescription insertNewObjectForEntityForName:kItemEntityName inManagedObjectContext:[self managedObjectContext]];
  newItem.name = itemName;

  NSError *error = nil;
  BOOL canSaveNewItem = [[self managedObjectContext] save:&error];
  if (!canSaveNewItem) 
  {
    [NSApp presentError:error]; 
  }

  [self clearFormFields];  // Private method that clears text fields, disables buttons
  [NSApp endSheet:[self window] returnCode:NSOKButton];
}

I am trying to write two test methods to verify this: one that checks a script in which the managed entity cannot save, and one where it successfully stores.

@interface SGAddItemWindowControllerTests : SGTestCase 
{
@private
  SGAddItemWindowController *addItemWindowController;
  id mockApp;
  id mockNameField;
}

- (void)setUp 
{
  mockNameField = [OCMockObject mockForClass:[NSTextField class]];
  mockApp = [OCMockObject mockForClass:[NSApplication class]];

  addItemWindowController = [[BLAddItemWindowController alloc] init];  
  [addItemWindowController setValue:mockNameField forKey:@"itemNameTextField"];
}

- (void)testAddingNewItemFromSheetFailed
{
  // Setup
  NSString *fakeName = @"";
  [[[mockNameField expect] andReturn:fakeName] stringValue];
  [[mockApp expect] presentError:[OCMArg any]];

  // Execute
  [addItemWindowController add:nil];

  // Verify
  [mockApp verify];
}

- (void)testAddingNewItemFromSheetSucceeds
{
  // Setup
  NSString *fakeName = @"Item Name";
  [[[mockNameField expect] andReturn:fakeName] stringValue];
  [[mockApp expect] endSheet:[OCMArg any] returnCode:NSOKButton];

  // Execute
  [addItemWindowController add:nil];

  // Verify
  [mockApp verify];
  [mockNameField verify];
}

@end

These are the problems that I know, but I'm not sure how to do this:

• I'm not sure how to handle the context of a managed entity in terms of a test. Should I open the entire main data stack or just create a layout NSManagedObjectContext?
• if . , save: , 1 .

, , , .

Answer 1

№ 1, NSManagedObjectContext, . , CoreData.

MWCoreDataTest ( GTMTestCase), moc

    - (NSManagedObjectContext *) managedObjectContext {

    if (managedObjectContext != nil) {
        return managedObjectContext;
    }

    NSPersistentStoreCoordinator *coordinator = [self persistentStoreCoordinator];
    if (coordinator != nil) {
        managedObjectContext = [[NSManagedObjectContext alloc] init];
        [managedObjectContext setPersistentStoreCoordinator: coordinator];
    }

    return managedObjectContext;
}



- (NSPersistentStoreCoordinator*)persistentStoreCoordinator;
{
    if (persistentStoreCoordinator) return persistentStoreCoordinator;
    NSError* error = nil;
    NSManagedObjectModel *mom = [self managedObjectModel];
    persistentStoreCoordinator = [[NSPersistentStoreCoordinator alloc]
                                  initWithManagedObjectModel:mom];


    if (![persistentStoreCoordinator addPersistentStoreWithType:NSInMemoryStoreType
                                                  configuration:nil
                                                            URL:nil
                                                        options:nil
                                                          error:&error]) {
        [[NSApplication sharedApplication] presentError:error];
        return nil;
    }
    return persistentStoreCoordinator;
}

WRT # 2, , - ,

[addItemWindowController setValue:mockNameField forKey:@"itemNameTextField"];

testAdding..

№ 1, itemNameText nil, .

WRT # 3, , NSApp ===, NSApplication

Answer 2

? , Core Data ? , CoreData?

, , , :

-(BOOL)saveNewItem:(NSString *)itemName error:(NSError **)error { 
    SGItem *newItem = [NSEntityDescription insertNewObjectForEntityForName:kItemEntityName inManagedObjectContext:[self managedObjectContext]];
  newItem.name = itemName;

  NSError *error = nil;
  return[[self managedObjectContext] save:&error];
}

- (IBAction)add:(id)sender {  
  NSString *itemName = [self.itemNameTextField stringValue];
  NSError *error = nil;
  BOOL canSaveNewItem = [self saveNewItem:itemName error:&error];
  if (!canSaveNewItem) {
    [NSApp presentError:error]; 
  }

  [self clearFormFields];  // Private method that clears text fields, disables buttons
  [NSApp endSheet:[self window] returnCode:NSOKButton];
}

, , , , -. -.

, , Core Data , .