test_runner: add support for --test-coverage-include-all

[avivkeller]

Add s a CLI option to include source files that were never loaded by the test run in the coverage
report, where they are reported as having zero coverage. Candidate files are searched for in the current working directory, and are subject to the same --test-coverage-include and --test-coverage-exclude filtering as the rest of the report.

Fixes: #58887

As discussed during today's @nodejs/test_runner meeting with @ljharb and @JakobJingleheimer

[nodejs-github-bot]

Review requested:

• @nodejs/config
• @nodejs/test_runner

[codecov]

Codecov Report

❌ Patch coverage is 23.21429% with 43 lines in your changes missing coverage. Please review.
✅ Project coverage is 90.12%. Comparing base (b2a024b) to head (8a951bb).
⚠️ Report is 48 commits behind head on main.

Files with missing lines	Patch %	Lines
lib/internal/test_runner/coverage.js	12.24%	43 Missing ⚠️

Additional details and impacted files

@@ Coverage Diff @@## main #64830 +/- ##
==========================================
- Coverage 90.15% 90.12% -0.04% 
==========================================
Files 744 746 +2 Lines 242542 242819 +277 Branches 45690 45741 +51 ==========================================
+ Hits 218672 218836 +164 - Misses 15362 15463 +101 - Partials 8508 8520 +12 

Files with missing lines	Coverage Δ
lib/internal/test_runner/runner.js	94.44% <100.00%> (+0.01%)	⬆️
lib/internal/test_runner/utils.js	66.35% <100.00%> (+0.09%)	⬆️
src/node_options.cc	76.62% <100.00%> (-0.08%)	⬇️
src/node_options.h	98.01% <100.00%> (+0.50%)	⬆️
lib/internal/test_runner/coverage.js	59.57% <12.24%> (-2.96%)	⬇️

... and 84 files with indirect coverage changes

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[nodejs-github-bot]

CI: https://ci.nodejs.org/job/node-test-pull-request/75310/

[nodejs-github-bot]

Commit Queue failed

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----------------------------------- PR info ------------------------------------
Title test_runner: add support for --test-coverage-include-all (#64830)
Author Aviv Keller <me@aviv.sh> (@avivkeller)
Branch avivkeller:test-coverage-include-all -> nodejs:main
Labels c++, semver-minor, lib / src, author ready, needs-ci
Commits 2
- test_runner: add support for --test-coverage-include-all
- Apply suggestions from code review
Committers 2
- avivkeller <me@aviv.sh>
- GitHub <noreply@github.com>
PR-URL: https://github.com/nodejs/node/pull/64830
Fixes: https://github.com/nodejs/node/issues/58887
Reviewed-By: Moshe Atlow <moshe@atlow.co.il>
Reviewed-By: Chemi Atlow <chemi@atlow.co.il>
------------------------------ Generated metadata ------------------------------
PR-URL: https://github.com/nodejs/node/pull/64830
Fixes: https://github.com/nodejs/node/issues/58887
Reviewed-By: Moshe Atlow <moshe@atlow.co.il>
Reviewed-By: Chemi Atlow <chemi@atlow.co.il>
--------------------------------------------------------------------------------
ℹ This PR was created on Wed, 29 Jul 2026 21:19:50 GMT
✔ Approvals: 2
✔ - Moshe Atlow (@MoLow): https://github.com/nodejs/node/pull/64830#pullrequestreview-4815157653
✔ - Chemi Atlow (@atlowChemi): https://github.com/nodejs/node/pull/64830#pullrequestreview-4818548199
✘ GitHub CI is still running
ℹ Last Full PR CI on 2026-07-30T15:53:22Z: https://ci.nodejs.org/job/node-test-pull-request/75310/
- Querying data for job/node-test-pull-request/75310/
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https://github.com/nodejs/node/actions/runs/30667054569

[avivkeller]

Landed in b7d29fe