As mentioned here:
https://github.com/mglaman/drupal-check/wiki/Drupal-9-Readiness
What if I have no compatibility issues?
You can add this drupalci.yml file to indicate you are Drupal 9 ready!
https://gist.github.com/josephdpurcell/1c78367cedc15a075e4231a5a685ced9
This will ensure that deprecation errors are not suppressed during test runs on Drupal CI.
Comments
Comment #3
nikolay borisov commentedComment #4
nikolay borisov commented