Dependency Extraction Webpack Plugin: Fix test issues #57332
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sirreal
added
[Type] Code Quality
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Size Change: 0 B Total Size: 1.71 MB ℹ️ View Unchanged
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Flaky tests detected in be0babc. 🔍 Workflow run URL: https://github.com/WordPress/gutenberg/actions/runs/7297949922
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gziolo
approved these changes
Dec 22, 2023
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What?
Fix test issues in the Dependency Extraction Webpack Plugin.
This also updates the test name and snapshots in preparation for #57199.
We add explicit options
target: 'web'andexperiments: {}. These do not change compilation (except for the hash), but are necessary for #57199.Why?
While working on #57199 I struggled with tests that would hang without explanation. This made debugging the issues very difficult. We address that by correctly surfacing the error and relying on a simpler structure of promises.
How?
The issue was because of the way we use webpack in the tests but don't correctly handle errors. Instead of passing an error to the callback, webpack was completing with the errors collected in its stats.
This PR makes the entire test async, and awaits a small promise that just wraps webpack and its callback.
We then check for errors in the webpack stats, and if they're found we throw an
Errorwith the descriptive string produced by webpack.Testing Instructions
CI passes.
I suggest reviewing the changes ignoring whitespace to better see the actual differences.
The snapshots will have different test names ("scripts" is added to the describe title) and the hash will be different due to configuration changes.
This can be tested with a patch like this:
The tests will fail with a message like this: