Preview or test the functionality of an app before making it live?

[darren_ross]

Is there a recommended way for a merchant to test whether an app from the Shopify App Store will work with their live store before they install it on their live store (since, if the app breaks anything, those problems would be visible to their customers)?

I know that Shopify has the Preview functionality to test a theme before making a theme live but what is the route for testing an app before making that app live?

I've hunted through the documentation and online for this but have yet to find a definitive answer.