I would to share the new 2.0 version of this fantastic script made by Roland Dreger: https://github.com/RolandDreger/open-type-features
This script is really a masterpiece.
You can test your fonts in InDesign with any OpenType feature and a little more.
Based on this Indesign script I made a "Find/Change script" to all registered OpenType features and the two exclusives for Indesign (Overlap Swash and Streched Alternate).
My script is much simpler them Roland Dreger
but I think it will be useful: https://github.com/samiartur/Indesign-Find-Change-Extended-Opentype-Features
Please let me know what You think.