Can you test Twitter card deep linking without a live app?


I’m working with a soon-to-be-live app and can’t seem to get the cards to open up the app despite the url scheme being appropriatly registered and the meta tags in order.

For page:

I’m assuming this has to do with the fact that the app is not in production? If that is the case, is there some way I can verify that deep linking actually works? The Twitter cards being displayed via sharing this page work fine apart from the deep linking bit.