Testing deferred props

[borovez]

How does one go about testing deferred props? I am trying to figure out how to mock the Inertia::defer() method and load the data synchronously for my tests

public function index(): Response
{
    $someService = new someService();

    return Inertia::render('Index', [
        'data' => Inertia::defer(fn() => SomeResource::make($someService->getData())),
    ]);
}