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Support an env option that is passed to the
underlying child_process.
Fixes: #60709

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Review requested:

  • @nodejs/test_runner

@nodejs-github-bot nodejs-github-bot added needs-ci PRs that need a full CI run. test_runner Issues and PRs related to the test runner subsystem. labels Jan 13, 2026
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codecov bot commented Jan 13, 2026

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.52%. Comparing base (1bd7f62) to head (cd4d84e).
⚠️ Report is 18 commits behind head on main.

Additional details and impacted files
@@           Coverage Diff           @@
##             main   #61367   +/-   ##
=======================================
  Coverage   88.51%   88.52%           
=======================================
  Files         704      704           
  Lines      208739   208786   +47     
  Branches    40274    40306   +32     
=======================================
+ Hits       184770   184827   +57     
+ Misses      15968    15956   -12     
- Partials     8001     8003    +2     
Files with missing lines Coverage Δ
lib/internal/test_runner/runner.js 93.02% <100.00%> (+0.07%) ⬆️

... and 39 files with indirect coverage changes

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Support an `env` option that is passed to the underlying child_process.
Fixes: nodejs#60709
const args = getRunArgs(path, opts);
const stdio = ['pipe', 'pipe', 'pipe'];
const env = { __proto__: null, ...process.env, NODE_TEST_CONTEXT: 'child-v8' };
const env = opts.env || { __proto__: null, ...process.env, NODE_TEST_CONTEXT: 'child-v8' };
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NODE_TEST_CONTEXT is used by the test runner to identify the runner subprocesses, and removing it may cause issues with the reporters.

It must be preserved even if the user passes opts.env.

I would suggest, in any case, adding a snapshot test when using this option to cover the E2E once the option has been provided!

* `functionCoverage` {number} Require a minimum percent of covered functions. If code
coverage does not reach the threshold specified, the process will exit with code `1`.
**Default:** `0`.
* `env` {Object} Specify environment variables to be passed along to the test process. This options is not compatible with `isolation='none'`.
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I think it might be worth specifying here that these variables will override those from the main process

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Test Runner run() should support env option

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