Heroku CI running tests twice per deploy
Looking at my tests overview in Heroku, I see that tests run twice for every build I want to push to production. The first time runs when I've opened a PR for a branch (I've prevented pushing directly to master) and the second after I've successfully merged.
Should this be happening and is there a way to avoid duplicate test runs and only run them on the branch I'm about to merge?
Solution
Yes, this is expected. Whenever you merge the PR, the master branch is updated. So the tests are rerun there.
Let's imagine 2 PRs:
master
|- commit A - PR1
|- commit B - PR2
You start by merging PR1. Commit A gets added to master. Then, you merge PR2.
But when that second PR was tested, it didn't have commit A in it's tree. So your tests could be failing.
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