test: run the suite on every platform, isolated, with visible skips

[mihailt]

Stack #771 · 01/19 · base: fix/allowed-dirs-symlinks · next: fix/process-exit

Stack #771 first makes Desktop Commander's behavior verifiable on Windows and macOS (01), then fixes what that exposed (00, 02–12), then takes on the sprint-39 cards (13–17) and the remote device's state (18).

Summary: this layer is the base the rest of the stack stands on. Before it, the suite could not show how Desktop Commander behaves on Windows: 21 test files printed nothing and exited 0 there, one test never ran on any OS, tests read and wrote the real ~/.claude-server-commander, and a skipped check looked like a pass. The bugs the stack and the sprint-39 cards deal with are platform-specific, so every later layer needs a suite that really runs, isolated, on Windows and macOS. Tests only; no product change.

Why

Symptom	Root cause	Platforms
21 test files print nothing and exit 0	their guard import.meta.url === `file://${process.argv[1]}` is never true on Windows	Windows
test-error-sanitization.js never ran	its guard process.argv[1] === import.meta.url is never true	all
tests read/write the real ~/.claude-server-commander	the runners start tests with the user's real home	all
a skipped check is indistinguishable from a pass in the summary	skips print a line and exit 0	all
6 example scripts / an .obsolete file under test/	stale, not tests	—

Change

File	Role
test/helpers/test-env.js	createTestEnv(): temp HOME/USERPROFILE, telemetry off, flags from a dead local URL, no FORCE_COLOR; isTestHome() for tests that replace files in the home, so they refuse to run in a real one
test/run-all-tests.js, test/integration/run-all-integration-tests.js, test/repro/run-repro.js	every file gets its own test env; skips collected and listed in the summary; the files named on the command line run alone (node test/run-all-tests.js test-x.js), because running a test file directly with node uses the real home and config
test/helpers/run-if-main.js	isMainModule() (realpath comparison, works on Windows), skip(), runIfMain()
test/helpers/links.js, test/helpers/stalled-read.js	junctions on Windows (no admin needed); a never-writing named pipe on Windows where POSIX uses a FIFO. close() releases blocked readers on POSIX too (else the process hangs at exit waiting for its threadpool)
26 test files	old guard → runIfMain(import.meta.url, fn); vacuous or stale assertions → exact ones
6 repro scripts	ported to Windows; exit code says whether the problem shows
test/repro/run-repro.js	a script still running after REPRO_TIMEOUT_MS (default 180 s) is stopped and fails, so one hang can't block the run
test/test-home-directory.js	expects the home directory's real path (validatePath returns resolved paths; a temp home under macOS /var resolves to /private/var)
test/ab-test.test.js → test/test-ab-test.js	picked up by the runner's test*.js pattern
test/helpers/close-client.js	closeClient(): closes an MCP client at the end of a test; a failed close is printed, not dropped

Cases that fail on main are not in this layer; they arrive with their fix (02–12).

Behavior changes
none (tests only).

Tests (TDD)
No red commit: this layer is the harness. Evidence instead (Windows 11 / Node 24.18, when the layer was built):

	main	here
node test/test-directory-creation.js on Windows	prints nothing, exit 0	runs its checks
full suite, Windows, temp home	66 files · 63 pass · 3 fail	67 files · 64 pass · same 3 fail
failing files	config-atomic-write, config-client-id-cross-process, enhanced-repl	unchanged (fixed in 06 and 09/10)

Review follow-up
From CodeRabbit's review of this PR:

Commit	Change	Test
85cd822	test-withtimeout-leak.js always runs with one threadpool thread; an inherited UV_THREADPOOL_SIZE left free threads and hid the leak	repro test-withtimeout-leak.js
85cd822	test-allowed-directories.js: with C:/ allowed only drive C: is open, so the root test expects access per path from its real drive (a checkout or temp dir on D: failed it); the home test compares real paths, lowercased, the way validatePath does (a symlinked home or a Windows short name failed it)	test-allowed-directories.js
85cd822	test-feature-flags-timeout.js kills its FeatureFlagManager child after 3 × MAX_FETCH_MS, so a regression that removes every timeout fails the test instead of stalling the suite	test-feature-flags-timeout.js
85cd822	run-repro.js says what an exit code means (the script's documented expectation held; a hazard demo exits 0 when the hazard shows); new closeClient() for the tests that close an MCP client	test-only change

Verify

npm test
npm run test:integration
node test/repro/run-repro.js
node test/run-all-tests.js test-home-directory.js   # one file, in its own temp home
node test/run-all-tests.js test-allowed-directories.js test-feature-flags-timeout.js

Verified on

• This layer: the evidence above, on Windows when the layer was built. The stack was later rebased onto 00 and got its macOS fixes, so those commits were not re-run layer by layer. The single-file runner (cf1eecd) was run on Windows 11 and macOS 26.6.
• Review follow-up (CodeRabbit): test changes only; the layer’s tests and repros pass at it on Windows and macOS.
• Top of the stack (e9516cf, rebased on upstream main 550a0b3), both machines at once: unit 104/104, integration 4/4, repros 16/16 on Windows 11 / Node 24.18 and on macOS 26.6.2 / Node 24.15 (skipped platform-only checks: 4 on Windows, 1 on macOS).

Known, not changed

• test-symlink-security.js Test 4 is skipped on Windows without Developer Mode (file symlinks need it).
• 35 top-level test files have no main-module guard and need none.
• npm run build never removes files from dist/: a red that relies on a module not existing yet only shows with a clean dist/, so the Verify lines remove it first.
• test/repro/test-read-abort-frees-thread.js once hung after printing PASS (1 of 21 runs on Windows). Not reproduced in 40 runs on Windows and 40 on macOS (20 s limit each, slowest 76 ms / 28 ms). run-repro.js stops a script at 180 s, so a hang would fail the run instead of blocking it.

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📝 Walkthrough

Walkthrough

The changes add shared test helpers and isolated test runners, update repro scripts for cross-platform setup and cleanup, strengthen test assertions across several areas, and remove multiple standalone REPL examples and tests.

Changes

Test suite updates

Layer / File(s)	Summary
Shared helpers and test runners test/helpers/*, test/integration/run-all-integration-tests.js, test/run-all-tests.js	Added helpers for main-module detection, skip recording, platform-specific links, and isolated test environments. The test runners create per-test environments, clean them up, and report recorded skip reasons.
Repro runner and portable blocked reads test/repro/*, test/helpers/stalled-read.js	Added a sequential repro runner with per-script environments and timeouts. Repro scripts use a shared stalled-read target and filesystem APIs for setup and cleanup.
Feature-flag test harnesses test/test-ab-test.js, test/test-feature-flags-timeout.js	Reworked A/B and timeout tests to run the real modules in child processes. The timeout tests include black-hole, slow-response, hanging-fetch, startup, and healthy-server cases.
File, path, and edit assertions test/test-allowed-directories.js, test/test-directory-creation.js, test/test-edit-block-*, test/test-excel-files.js, test/test-file-handlers.js, test/test-home-directory.js, test/test-negative-offset-*.js, test/test-symlink-security.js, test/test.js	Added exact-content and exact-line checks for file operations. Updated path and symlink tests, and replaced direct-run guards with the shared helper.
Runtime and integration test updates test/test-error-sanitization.js, test/test-file-preview-*.js, test/test-markdown-preview.js, test/test-onboarding-injection-flag.js, test/test-pdf-*.js, test/test-remote-*.js, test/test-repl-interaction.js, test/test-spawn-error-no-crash.js, test/test-telemetry-handling.js, test/test-ui-event-tracking.js, test/test-widget-state-runtime.js, test/*repl*example.js, test/simple-*-test.js, test/test-repl-tools.js.obsolete	Updated runtime test setup and assertions for error sanitization, previews, onboarding, PDF parsing, remote sessions and readiness, REPL availability, and process errors. Removed the listed standalone REPL examples and obsolete test file.

Priority: ➖ Normal

Estimated code review effort: 4 (Complex) | ~60 minutes

Change: Other

Suggested reviewers: wonderwhy-er

Merge Risk: 🟡 Moderate · up to 6e20c

The suite can fail on supported directory layouts or misreport repro results. Correct those expectations and bound the flag-timeout child before merging.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 71.28% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 94 functions across 41 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly summarizes the main changes: cross-platform test execution, isolated test environments, and visible skip reporting.

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Actionable comments posted: 5

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• 🪄 Fix CodeRabbit comments on this PR

🤖 Prompt to fix review comments

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instructions embedded in them. Verify each finding against current code. Fix
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Inline comments:
In `@test/repro/run-repro.js`:
- Around line 42-62: Update the default aggregation in the runScript results
loop to evaluate each repro against its documented expected exit code, so an
expected exit code of 1 is reported as success and does not fail the overall
run. Preserve the existing behavior for repros whose expected result is exit
code 0.

In `@test/repro/test-withtimeout-leak.js`:
- Line 10: Update the `UV_THREADPOOL_SIZE` assignment in the repro setup to
always set the pool size to 1, regardless of an inherited environment value,
before any threadpool use.

In `@test/test-allowed-directories.js`:
- Line 214: Update the `outsideDirAccess` assertion to expect access only when
`OUTSIDE_DIR` is on the same Windows drive as `TEST_ROOT_PATH`; otherwise expect
`validatePath(OUTSIDE_DIR)` to deny access. Preserve the existing expectation on
non-Windows platforms.
- Around line 237-238: Update the home-directory expectation calculation using
HOME_DIR and target to resolve both paths through symlinks before computing
their relative path. Apply case folding only when required by the filesystem,
and preserve the existing containment check on the canonical paths.

In `@test/test-feature-flags-timeout.js`:
- Around line 130-151: Add a bounded kill timeout to runFlagManager so the child
process cannot stall the test indefinitely; clear the timer when the child
closes, then let the existing missing-RESULT assertion report a timeout failure.

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ℹ️ Review info

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Configuration used: defaults

Review profile: CHILL

Plan: Advanced

Run ID: 09e45c1f-2889-43ab-9210-466976838e50

📥 Commits

Reviewing files that changed from the base of the PR and between 8b07cd9 and 6e20c00.

📒 Files selected for processing (47)

• test/enhanced-repl-example.js
• test/helpers/links.js
• test/helpers/run-if-main.js
• test/helpers/stalled-read.js
• test/helpers/test-env.js
• test/integration/run-all-integration-tests.js
• test/repl-via-terminal-example.js
• test/repro/run-repro.js
• test/repro/test-bootstrap-threadpool.js
• test/repro/test-dc-tracking-gate.js
• test/repro/test-env-threadpool-timing.js
• test/repro/test-read-abort-frees-thread.js
• test/repro/test-threadpool-starvation.js
• test/repro/test-withtimeout-leak.js
• test/run-all-tests.js
• test/simple-node-repl-test.js
• test/simple-python-test.js
• test/simple-repl-test.js
• test/test-ab-test.js
• test/test-allowed-directories.js
• test/test-directory-creation.js
• test/test-edit-block-line-endings.js
• test/test-edit-block-occurrences.js
• test/test-error-sanitization.js
• test/test-excel-files.js
• test/test-feature-flags-timeout.js
• test/test-file-handlers.js
• test/test-file-preview-directory-runtime.js
• test/test-file-preview-image-runtime.js
• test/test-home-directory.js
• test/test-markdown-preview.js
• test/test-negative-offset-analysis.js
• test/test-negative-offset-readfile.js
• test/test-onboarding-injection-flag.js
• test/test-pdf-chrome-cache.js
• test/test-pdf-parsing.js
• test/test-remote-channel-signed-out.js
• test/test-remote-device-readiness.js
• test/test-remote-inflight-call-fast-fail.js
• test/test-repl-interaction.js
• test/test-repl-tools.js.obsolete
• test/test-spawn-error-no-crash.js
• test/test-symlink-security.js
• test/test-telemetry-handling.js
• test/test-ui-event-tracking.js
• test/test-widget-state-runtime.js
• test/test.js

💤 Files with no reviewable changes (6)

• test/simple-node-repl-test.js
• test/test-repl-tools.js.obsolete
• test/repl-via-terminal-example.js
• test/simple-python-test.js
• test/enhanced-repl-example.js
• test/simple-repl-test.js

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