Commit 66f26d3a9b9 for nodejs

commit 66f26d3a9b91b065dc976d7542bb7dfccb6c4069
Author: Filip Skokan <panva.ip@gmail.com>
Date:   Thu Sep 24 09:39:15 2026 +0200

    test: deflake test runner timeout coverage

    Use a dedicated fixture with a pending promise and assertion plan
    instead of competing assertion timers. Keep both timeout failure
    assertions and clear the keepalive interval after the tests finish.

    Signed-off-by: Filip Skokan <panva.ip@gmail.com>
    Assisted-by: Codex
    PR-URL: https://github.com/nodejs/node/pull/66255
    Reviewed-By: Aviv Keller <me@aviv.sh>
    Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com>

diff --git a/test/fixtures/test-runner/run-timeout.mjs b/test/fixtures/test-runner/run-timeout.mjs
new file mode 100644
index 00000000000..8367bd22b4c
--- /dev/null
+++ b/test/fixtures/test-runner/run-timeout.mjs
@@ -0,0 +1,11 @@
+import test, { after } from 'node:test';
+
+// Keep the event loop alive until both tests time out.
+const interval = setInterval(() => {}, 1000);
+after(() => clearInterval(interval));
+
+test('pending promise', () => new Promise(() => {}));
+
+test('pending assertion plan', (t) => {
+  t.plan(1, { wait: true });
+});
diff --git a/test/parallel/test-runner-run.mjs b/test/parallel/test-runner-run.mjs
index d1d384a522e..a973ecb7cb7 100644
--- a/test/parallel/test-runner-run.mjs
+++ b/test/parallel/test-runner-run.mjs
@@ -90,7 +90,7 @@ describe('require(\'node:test\').run', { concurrency: true }, () => {

   it('should support timeout', async () => {
     const stream = run({ timeout: 50, files: [
-      fixtures.path('test-runner', 'plan', 'timeout-basic.mjs'),
+      fixtures.path('test-runner', 'run-timeout.mjs'),
     ] });
     stream.on('test:fail', common.mustCall((data) => {
       assert.strictEqual(data.details.error.failureType, 'testTimeoutFailure');