Hi, first of all, thanks for planning to update remotestorage-ruby!
I took a look at the api-test-suite, it does check for the file/folder collisions that was added in version 12 of the spec, so it is a good starting point for your goal. We’re going to take a look to see if other specs are missing (there were not many others changes if I remember correctly), as well as update the outdated README that’s saying it supports -03 to -05.
Author of Inspektor here. I guess Inspektor is more useful for app development than server development, because it’s just a file browser for RS accounts. But if you run the api-test-suite against your server and it’s green, then all apps should work with it, including Inspektor.
I forgot to mention that you can probably draw some inspiration and potentially straight-up source code from liquor-cabinet, which drives the 5apps Storage RS API in production. (It’s a Sinatra app, so it’s all Ruby.)