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If you are a Drupal contributor, one of the things that immediately pops into your mind is the time that takes to test your patch. Testing happens throughout the whole workflow of getting a change in Drupal core and contrib modules. Testing is what keeps you awake to see if your patch failed or passed. Testing is what makes you pull out your hair or jump with joy.
You will probably be happy to know that, at the Drupal testing team, we are working hard to make sure the process is improved.