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    <p>Justin,</p> <p>What I do for question #1 is to create an actual NSManagedObjectContext but create an im-memory persistence store. Nothing hits the disk and I test the CoreData version of the truth.</p> <p>I have a MWCoreDataTest class (extends in my case GTMTestCase) that builds the moc and initializes the persistence store</p> <pre><code> - (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:&amp;error]) { [[NSApplication sharedApplication] presentError:error]; return nil; } return persistentStoreCoordinator; } </code></pre> <p>WRT #2, I think that's ok - if you plan on testing more than one behavior in the class, move the </p> <pre><code>[addItemWindowController setValue:mockNameField forKey:@"itemNameTextField"]; </code></pre> <p>to the testAdding.. method</p> <p>If you solve #1, then you could just set the itemNameText field to nil and your save validation would trigger.</p> <p>WRT #3, I would validate that building a mock on NSApp === building a mock on NSApplication</p>
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