test_runner: make it compatible with fake timers

[mcollina]

If setTimeout is monkey-patched, it might be missing the symbol. Moreover, we plan to remove it in the future anyway in #58689.

[nodejs-github-bot]

Review requested:

• @nodejs/test_runner

[rluvaton]

Can you please add a test?

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.65%. Comparing base (e78bf55) to head (2779c84).
⚠️ Report is 129 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #59272   +/-   ##
=======================================
  Coverage   89.64%   89.65%           
=======================================
  Files         676      676           
  Lines      206249   206326   +77     
  Branches    39518    39529   +11     
=======================================
+ Hits       184892   184974   +82     
+ Misses      13479    13474    -5     
  Partials     7878     7878           

Files with missing lines	Coverage Δ
lib/internal/test_runner/test.js	96.80% <100.00%> (ø)

... and 32 files with indirect coverage changes

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.

[nodejs-github-bot]

CI: https://ci.nodejs.org/job/node-test-pull-request/70655/

[nodejs-github-bot]

CI: https://ci.nodejs.org/job/node-test-pull-request/71595/

[JakobJingleheimer]

CI: https://ci.nodejs.org/job/node-test-pull-request/71595/

This has disappeared (there seems to be an on-going issue related to this).

[nodejs-github-bot]

CI: https://ci.nodejs.org/job/node-test-pull-request/71661/

[nodejs-github-bot]

Commit Queue failed

- Loading data for nodejs/node/pull/59272
✔  Done loading data for nodejs/node/pull/59272
----------------------------------- PR info ------------------------------------
Title      test_runner: make it compatible with fake timers (#59272)
Author     Matteo Collina <matteo.collina@gmail.com> (@mcollina)
Branch     mcollina:compatibility-with-fake-timers -> nodejs:main
Labels     author ready, needs-ci, test_runner
Commits    2
 - test_runner: make it compatible with fake timers
 - test_runner: add test for fake timers compatibility with timeout
Committers 1
 - Matteo Collina <hello@matteocollina.com>
PR-URL: https://github.com/nodejs/node/pull/59272
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Chemi Atlow <chemi@atlow.co.il>
Reviewed-By: Moshe Atlow <moshe@atlow.co.il>
Reviewed-By: Aviv Keller <me@aviv.sh>
Reviewed-By: Paolo Insogna <paolo@cowtech.it>
------------------------------ Generated metadata ------------------------------
PR-URL: https://github.com/nodejs/node/pull/59272
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Chemi Atlow <chemi@atlow.co.il>
Reviewed-By: Moshe Atlow <moshe@atlow.co.il>
Reviewed-By: Aviv Keller <me@aviv.sh>
Reviewed-By: Paolo Insogna <paolo@cowtech.it>
--------------------------------------------------------------------------------
   ℹ  This PR was created on Tue, 29 Jul 2025 09:46:09 GMT
   ✔  Approvals: 5
   ✔  - James M Snell (@jasnell) (TSC): https://github.com/nodejs/node/pull/59272#pullrequestreview-3068494804
   ✔  - Chemi Atlow (@atlowChemi): https://github.com/nodejs/node/pull/59272#pullrequestreview-3069013804
   ✔  - Moshe Atlow (@MoLow): https://github.com/nodejs/node/pull/59272#pullrequestreview-3105248861
   ✔  - Aviv Keller (@avivkeller): https://github.com/nodejs/node/pull/59272#pullrequestreview-3971839550
   ✔  - Paolo Insogna (@ShogunPanda) (TSC): https://github.com/nodejs/node/pull/59272#pullrequestreview-3904476398
   ✔  Last GitHub CI successful
   ℹ  Last Full PR CI on 2026-03-10T14:43:23Z: https://ci.nodejs.org/job/node-test-pull-request/71661/
- Querying data for job/node-test-pull-request/71661/
✔  Build data downloaded
   ✔  Last Jenkins CI successful
--------------------------------------------------------------------------------
   ✔  No git cherry-pick in progress
   ✔  No git am in progress
   ✔  No git rebase in progress
--------------------------------------------------------------------------------
- Bringing origin/main up to date...
From https://github.com/nodejs/node
 * branch                  main       -> FETCH_HEAD
✔  origin/main is now up-to-date
- Downloading patch for 59272
From https://github.com/nodejs/node
 * branch                  refs/pull/59272/merge -> FETCH_HEAD
✔  Fetched commits as f68824a6805a..2779c84ba2f3
--------------------------------------------------------------------------------
[main 18611378d4] test_runner: make it compatible with fake timers
 Author: Matteo Collina <hello@matteocollina.com>
 Date: Tue Jul 29 11:44:47 2025 +0200
 1 file changed, 1 insertion(+), 1 deletion(-)
[main a80d665aa6] test_runner: add test for fake timers compatibility with timeout
 Author: Matteo Collina <hello@matteocollina.com>
 Date: Wed Mar 4 15:59:18 2026 +0100
 2 files changed, 57 insertions(+)
 create mode 100644 test/fixtures/test-runner/mock-timers-with-timeout.js
 create mode 100644 test/parallel/test-runner-mock-timers-with-timeout.js
   ✔  Patches applied
There are 2 commits in the PR. Attempting autorebase.
(node:350) [DEP0190] DeprecationWarning: Passing args to a child process with shell option true can lead to security vulnerabilities, as the arguments are not escaped, only concatenated.
(Use `node --trace-deprecation ...` to show where the warning was created)
Rebasing (2/4)
Executing: git node land --amend --yes
--------------------------------- New Message ----------------------------------
test_runner: make it compatible with fake timers
Signed-off-by: Matteo Collina <hello@matteocollina.com>

PR-URL: #59272

Reviewed-By: James M Snell <jasnell@gmail.com>

Reviewed-By: Chemi Atlow <chemi@atlow.co.il>

Reviewed-By: Moshe Atlow <moshe@atlow.co.il>

Reviewed-By: Aviv Keller <me@aviv.sh>

Reviewed-By: Paolo Insogna <paolo@cowtech.it>
[detached HEAD 59aa153f1b] test_runner: make it compatible with fake timers

Author: Matteo Collina <hello@matteocollina.com>

Date: Tue Jul 29 11:44:47 2025 +0200

1 file changed, 1 insertion(+), 1 deletion(-)

Rebasing (3/4)

Rebasing (4/4)

Executing: git node land --amend --yes

--------------------------------- New Message ----------------------------------

test_runner: add test for fake timers compatibility with timeout
Signed-off-by: Matteo Collina <hello@matteocollina.com>

PR-URL: #59272

Reviewed-By: James M Snell <jasnell@gmail.com>

Reviewed-By: Chemi Atlow <chemi@atlow.co.il>

Reviewed-By: Moshe Atlow <moshe@atlow.co.il>

Reviewed-By: Aviv Keller <me@aviv.sh>

Reviewed-By: Paolo Insogna <paolo@cowtech.it>
[detached HEAD bde5b3bf87] test_runner: add test for fake timers compatibility with timeout

Author: Matteo Collina <hello@matteocollina.com>

Date: Wed Mar 4 15:59:18 2026 +0100

2 files changed, 57 insertions(+)

create mode 100644 test/fixtures/test-runner/mock-timers-with-timeout.js

create mode 100644 test/parallel/test-runner-mock-timers-with-timeout.js

Successfully rebased and updated refs/heads/main.
ℹ  Add commit-queue-squash label to land the PR as one commit, or commit-queue-rebase to land as separate commits.

https://github.com/nodejs/node/actions/runs/23274294427

[nodejs-github-bot]

Landed in 8199f9c

[eagle19900203-boop]

If setTimeout is monkey-patched, it might be missing the symbol. Moreover, we plan to remove it in the future anyway in #58689.