I spend a lot of time to figure it out how to test UIViewController.
Notes here:
UIViewController didn't load when initiated
UIStoryboard *storyboard =[UIStoryboard storyboardWithName:@"MainStoryboard" bundle:nil];
MyViewController *viewController =[storyboard instantiateViewControllerWithIdentifier:@"MyController"];
An UIViewController class been initiated and shown didn't mean it's been loaded. You can't reach IBOutlets instances, IBActions at this state.
[viewController view];
This will load up the view from the StoryBoard, then invoke its -viewDidLoad. You should then be able to test its state.
ViewWillAppear, ViewWillDisappear, ViewDidAppear, ViewDidDisappear get called but get unexpected results (nil objects)
Unit tests run synchronously. Anything that is — or can be — animated won't work in a normal unit test, because the test will be done before the change takes place.
Be careful to set animation:NO to above methods in unit tesing.
[viewController viewWillAppear:NO];