Enable E2E tests on Linux

[ivan-ottinger]

Related issues

• Related to https://linear.app/a8c/issue/RSM-1856/review-and-fix-e2e-tests-on-linux

How AI was used in this PR

Drafted with Claude Code under interactive review. The author pushed back on overstated claims (e.g. attributing the OOM to PHP WASM workers when only the symptom was verified) and on a speculative selector change that was reverted after confirming it was unnecessary. Each change here was vetted against the actual test runs and existing codebase conventions.

Proposed Changes

• Add process.env.E2E guard to autoInstallLinuxCliIfNeeded so a packaged Linux build does not write to the host user's ~/.bashrc or ~/.local/bin/studio during E2E runs.
  • Verified by inspecting the bundle from electron-vite build: vite statically replaces process.env.NODE_ENV with "production", so the existing NODE_ENV !== 'production' guard collapses to a dead false in the bundle (the same substitution applies to the full package flow, which just wraps the vite output). Without the new process.env.E2E term, the function would fire during E2E and call installCli(), which uses os.homedir() directly — and E2E_HOME_PATH does not override that.
  • The Mac/Windows installers use the same NODE_ENV-only guard pattern, but extending the fix to them is out of scope here: the analog has not been verified on those platforms from this Linux box, and shipping a guard on inference alone is the kind of thing this PR is trying to avoid.
• Reduce concurrent running sites in blueprints.test.ts to one at a time. The shared session previously accumulated 6+ running sites by the end of the file, which crashes memory-constrained hosts (e.g. local Linux VMs). Each blueprint test now runs with only its own site; the default onboarding site is stopped after beforeAll, and each newly created site is stopped after the test completes.
• Update getStopAllButton in main-sidebar.ts to match both "Stop" (single running site) and "Stop all" (multiple). The button text is conditional in running-sites.tsx; the existing locator only matched "Stop all" exactly, which made the new cleanup logic in blueprints unreliable when one site was running.

Testing Instructions

1. Build the app: npm run make.
2. Install Playwright browsers: npx playwright install chromium.
3. Run the full suite: npm run e2e.
4. Expected outcome on Linux: 43 pass, 1 skipped (import.test.ts is skipped without the optional e2e/imports/jetpack-backup.tar.gz fixture). A few editor-iframe tests may flake on the first attempt and pass on Playwright's automatic retry.

Verified locally on Linux arm64 (Parallels VM). Mac/Windows behavior should be unchanged: the blueprints cleanup adds ~15-30s to that file's run time, otherwise no functional difference.

Pre-merge Checklist

• Have you checked for TypeScript, React or other console errors?
• Mac and Windows E2E jobs still pass on CI.

[Copilot]

Pull request overview

Enables Linux E2E stability/safety by preventing Linux CLI auto-install side effects during E2E runs and reducing resource usage in the blueprint E2E suite.

Changes:

• Skip autoInstallLinuxCliIfNeeded() during E2E runs to avoid writing to the host user’s home/profile.
• Update the main sidebar “Stop” locator to handle both single-site and multi-site labels.
• Run blueprint E2E tests with a single running site at a time by stopping sites between tests.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
apps/studio/src/modules/cli/lib/linux-installation-manager.ts	Adds an E2E guard to prevent Linux CLI auto-install during E2E.
apps/studio/e2e/page-objects/main-sidebar.ts	Updates stop button locator to match both “Stop” and “Stop all”.
apps/studio/e2e/blueprints.test.ts	Stops the default onboarding site after setup and stops sites after each blueprint test to reduce peak memory.

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

[wpmobilebot]

📊 Performance Test Results

Comparing bcdcd24 vs trunk

app-size

Metric	trunk	bcdcd24	Diff	Change
App Size (Mac)	1507.60 MB	1507.60 MB	+0.00 MB	⚪ 0.0%

site-editor

Metric	trunk	bcdcd24	Diff	Change
load	1858 ms	1818 ms	40 ms	⚪ 0.0%

site-startup

Metric	trunk	bcdcd24	Diff	Change
siteCreation	8086 ms	8076 ms	10 ms	⚪ 0.0%
siteStartup	4946 ms	4952 ms	+6 ms	⚪ 0.0%

---

Results are median values from multiple test runs.

Legend: 🟢 Improvement (faster) | 🔴 Regression (slower) | ⚪ No change (<50ms diff)

[gavande1]

I have verified locally on Linux ARM64 — all 43 tests pass, 1 skipped as expected. Thanks for getting E2E green on Linux! 🎉