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copied!<p>You need to build a Core Data stack, either within each method or in <code>-setUp</code> and then tear it down. Using an <code>NSInMemoryPersistentStore</code> will keep things fast and in-memory for your unit tests. Add a <code>@property (nonatomic,retain) NSManagedObjectContext *moc</code> to your TestCase subclass. Then:</p> <pre><code>- (void)setUp { NSManagedObjectModel *mom = [NSManagedObjectModel mergedModelFromBundles:[NSArray arrayWithObject:bundleContainingXCDataModel]]; NSPersistentStoreCoordinator *psc = [[NSPersistentStoreCoordinator alloc] initWithManagedObjectModel:mom]; STAssertTrue([psc addPersistentStoreWithType:NSInMemoryStoreType configuration:nil URL:nil options:nil error:NULL] ? YES : NO, @"Should be able to add in-memory store"); self.moc = [[NSManagedObjectContext alloc] init]; self.moc.persistentStoreCoordinator = psc; [mom release]; [psc release]; } - (void)tearDown { self.moc = nil; } </code></pre> <p>Your test method then looks like:</p> <pre><code>- (void)test_full_name_returns_correct_string { Patient *patient = [NSEntityDescription insertNewObjectForEntityForName:@"Person" inManagedObjectContext:self.moc]; patient.firstName = @"charlie"; patient.lastName = @"chaplin"; STAssertTrue([[patient fullName] isEqualToString:@"charlie chaplin"], @"should have matched full name"); } </code></pre> <p>assuming your entity is named <code>Person</code>. There was a memory leak in your version of the method, by the way; patient should be <code>-release</code>'d in the non-Core Data version (<code>insertNewObjectForEntityForName:managedObjectContext:</code> returns an autoreleased instance).</p>

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