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Enable flaky tests reporter bot in PRs #35029

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merged 2 commits into from
Sep 28, 2021

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kevin940726
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Description

Continued from #34432. The bot has been enabled for a week now and is pretty stable on trunk. I think it makes sense to enable it on all PRs to unblock contributors from flaky e2e tests.

You can view all the issues the bot has created.

How has this been tested?

No way to test it for now. We just have to be sure that the bot won't run arbitrary code from all PRs opened in this repo for security reasons.

Types of changes

New feature

Checklist:

  • My code is tested.
  • My code follows the WordPress code style.
  • My code follows the accessibility standards.
  • I've tested my changes with keyboard and screen readers.
  • My code has proper inline documentation.
  • I've included developer documentation if appropriate.
  • I've updated all React Native files affected by any refactorings/renamings in this PR (please manually search all *.native.js files for terms that need renaming or removal).

@kevin940726 kevin940726 added the [Type] Automated Testing Testing infrastructure changes impacting the execution of end-to-end (E2E) and/or unit tests. label Sep 22, 2021
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github-actions bot commented Sep 22, 2021

Size Change: +4.54 kB (0%)

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@talldan
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talldan commented Sep 22, 2021

One concern I have is that a PR can be significantly behind trunk and still be running flaky tests that have been solved in trunk. Any thoughts on that @kevin940726?

Maybe it'd be worth investing time into making sure tests always run on the latest code in trunk. I never really understood why they don't do that.

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@talldan's comment aside, the code looks good 👍

@kevin940726
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Maybe it'd be worth investing time into making sure tests always run on the latest code in trunk. I never really understood why they don't do that.

Good question! I don't really know either, but I'd imagine it's the other way around. I'll do some research.

@kevin940726
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Okay I did some research.

The pull_request event our e2e workflow is running on will run on the merge commit of that PR to the latest base branch. GITHUB_REF will look something like refs/pull/:prNumber/merge, and GITHUB_SHA is the latest commit of GITHUB_REF, that's why GITHUB_SHA is not the same as the latest commit of the PR. Github will automatically do a merge on their side and use the latest merge commit to run our tests. As for branches with merge conflicts, GH simply won't trigger the pull_request event (ref).

Maybe it'd be worth investing time into making sure tests always run on the latest code in trunk. I never really understood why they don't do that.

So I think it's the other way around. GH will always run on the latest code on trunk.

@kevin940726
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I also added a note in the testing documentation. Please help review it if you think it needs more clarity :).

@noisysocks
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Thanks for checking that. I say let's try it :shipit:

@kevin940726 kevin940726 merged commit aeac316 into trunk Sep 28, 2021
@kevin940726 kevin940726 deleted the add/flaky-test-report-bot-in-pr branch September 28, 2021 01:58
@github-actions github-actions bot added this to the Gutenberg 11.7 milestone Sep 28, 2021
@talldan
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talldan commented Sep 29, 2021

So I think it's the other way around. GH will always run on the latest code on trunk.

I'm not completely confident about that, because regularly I've seen the advice to 'rebase a PR' when a test has been fixed in trunk and have observed that happening, even had it happen in my own PRs. If the tests already run based on code merged with the trunk that wouldn't be needed.

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I'm not completely confident about that, because regularly I've seen the advice to 'rebase a PR' when a test has been fixed in trunk and have observed that happening, even had it happen in my own PRs. If the tests already run based on code merged with the trunk that wouldn't be needed.

It just happened to one of my PR and I think I know why. It's because rebasing a PR is the easiest way to re-trigger the workflow. If we only re-run the workflow, the commit will still be the outdated merged commit that never pass, we have to re-trigger the pull_request event. The easiest way to re-trigger the event is to rebase it onto the latest trunk, which will have the updated merge commit. Does that make sense?

I guess we could try creating the merge commit on our end using @actions/checkout if necessary. Not sure if it's worth it though 🤔. Probably need to get back to this in the future if needed.

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talldan commented Oct 13, 2021

It just happened to one of my PR and I think I know why. It's because rebasing a PR is the easiest way to re-trigger the workflow. If we only re-run the workflow, the commit will still be the outdated merged commit that never pass, we have to re-trigger the pull_request event. The easiest way to re-trigger the event is to rebase it onto the latest trunk, which will have the updated merge commit. Does that make sense?

Right, I see. So technically if an empty commit is pushed, that will make the workflow use the latest merge ref?

@kevin940726
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So technically if an empty commit is pushed, that will make the workflow use the latest merge ref?

I think so, but I haven't tested it 😅.

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