ci(testing): reduce e2e test parallelism in CI to fix flaky tests

[adrianschmidt]

Work around Stencil v4 e2e test parallelization issues that cause random timeouts in CI but not locally. Changes only apply when CI=true.

• Add --disable-gpu browser arg in stencil.config.ts
• Add --max-workers=2 in run-tests.cjs

See: stenciljs/core#6157

Summary by CodeRabbit

• Chores
  • Optimized test execution performance in continuous integration environments
  • Enhanced test stability by adjusting resource allocation for parallel test runs
  • Improved debugging diagnostics with additional logging during test execution

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Review:

• Commits are atomic
• Commits have the correct type for the changes made
• Commits with breaking changes are marked as such

Browsers tested:

(Check any that applies, it's ok to leave boxes unchecked if testing something didn't seem relevant.)

Windows:

• Chrome
• Edge
• Firefox

Linux:

• Chrome
• Firefox

macOS:

• Chrome
• Firefox
• Safari

Mobile:

• Chrome on Android
• iOS

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📝 Walkthrough

Walkthrough

Both files are modified to optimize testing behavior in CI environments by conditionally disabling GPU and reducing test parallelism, along with enhanced debug logging. The changes use environment variable detection to apply CI-specific test configurations.

Changes

Cohort / File(s)	Summary
CI Test Optimization scripts/run-tests.cjs, stencil.config.ts	Added conditional CI detection via environment variable. When CI is active, run-tests.cjs now reduces test parallelism to 2 workers and logs debug mode enablement. stencil.config.ts conditionally appends --disable-gpu flag to browserArgs to mitigate parallelization issues in CI.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and specifically describes the main change: reducing e2e test parallelism in CI to fix flaky tests, which is the core objective of the changeset.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch fix-flaky-tests

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[adrianschmidt]

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[github-actions]

Documentation has been published to https://lundalogik.github.io/lime-elements/versions/PR-3789/

[adrianschmidt]

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[adrianschmidt]

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Actionable comments posted: 2

🤖 Fix all issues with AI agents

In `@scripts/run-tests.cjs`:
- Around line 20-25: Update the comment above the CI parallelism adjustment to
accurately reflect the library version or intent: change the mention of "Stencil
v4" to "Stencil v3.4.2" (or note that this is a forward-looking workaround for
potential Stencil v4 issues) so the comment matches the project context; the
change should be made in the block that checks isCI and pushes '--max-workers=2'
(see the isCI condition, args.push('--max-workers=2') and the console.log
statement) to avoid version confusion.

In `@stencil.config.ts`:
- Around line 52-57: The browserArgs spread uses a simple truthy check on
process.env.CI which is inconsistent with run-tests.cjs; change the conditional
to use the shared helper envIsSet('CI') (the same function used in
run-tests.cjs) so edge cases like '0'/'false' are handled consistently, and add
the corresponding import for envIsSet at the top of stencil.config.ts; update
the spread expression in browserArgs to use envIsSet('CI') instead of
process.env.CI.