Nope, we were able to use their UI to create our tests just like any other user would -- everything we needed was supported out of the box (minus one minor work

Nope, we were able to use their UI to create our tests just like any other user would -- everything we needed was supported out of the box (minus one minor workaround I had to add to my code because I had some janky, non-deterministic IDs on some dynamically added hidden fields).