Is it possible to create UI tests for an iMessage Sticker Pack?

Weird question, I know. I have a designer that is continuously designing graphics and depositing it in a shared folder. I want to write a script that will automatically copy the graphics over to the Xcode project's .xcassets, use fastlane to generate the screenshots (the other metadata can be read from a static file), and release the update to the App Store.

However, I can't figure out how to write UI tests for a sticker pack and therefore I can't take a screenshot. Is this even possible? If not, how else can I programmatically generate screenshots for my stickers?
Is it possible to create UI tests for an iMessage Sticker Pack?
 
 
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