Use case

Currently, engine scenario tests are run through a bash script. I had to add some logic to fix a bug.

@zanderso commented:

My sense is that the logic in this script is outgrowing what we'd normally like to maintain in a bash script. We should consider porting this to Python, or ideally Dart if possible.
flutter/engine#50835 (review)

Proposal

Instead of using a bash script to run the tests, use a python or dart script.