test_runner: ref test timeout timers

lib/internal/test_runner/test.js

@@ -89,7 +89,6 @@ function stopTest(timeout, signal) {
     disposeFunction = abortListener[SymbolDispose];
   } else {
     timer = setTimeout(() => deferred.resolve(), timeout);
-    timer.unref();
 
     ObjectDefineProperty(deferred, 'promise', {
       __proto__: null,

test/fixtures/test-runner/output/timeout_ref.js

@@ -0,0 +1,7 @@
+'use strict';
+const { test } = require('node:test');
+
+test('callback test that times out', { timeout: 1 }, (t, done) => {});
+test('promise test that times out', { timeout: 1 }, () => {
+  return new Promise(() => {});
+});

test/fixtures/test-runner/output/timeout_ref.snapshot

@@ -0,0 +1,28 @@
+TAP version 13
+# Subtest: callback test that times out
+not ok 1 - callback test that times out
+  ---
+  duration_ms: *
+  location: '/test/fixtures/test-runner/output/timeout_ref.js:(LINE):1'
+  failureType: 'testTimeoutFailure'
+  error: 'test timed out after 1ms'
+  code: 'ERR_TEST_FAILURE'
+  ...
+# Subtest: promise test that times out
+not ok 2 - promise test that times out
+  ---
+  duration_ms: *
+  location: '/test/fixtures/test-runner/output/timeout_ref.js:(LINE):1'
+  failureType: 'testTimeoutFailure'
+  error: 'test timed out after 1ms'
+  code: 'ERR_TEST_FAILURE'
+  ...
+1..2
+# tests 2
+# suites 0
+# pass 0
+# fail 0
+# cancelled 2
+# skipped 0
+# todo 0
+# duration_ms *

test/parallel/test-runner-output.mjs

@@ -94,6 +94,7 @@ const tests = [
   { name: 'test-runner/output/hooks.js' },
   { name: 'test-runner/output/hooks_spec_reporter.js', transform: specTransform },
   { name: 'test-runner/output/timeout_in_before_each_should_not_affect_further_tests.js' },
+  { name: 'test-runner/output/timeout_ref.js' },
   { name: 'test-runner/output/hooks-with-no-global-test.js' },
   { name: 'test-runner/output/global-hooks-with-no-tests.js' },
   { name: 'test-runner/output/before-and-after-each-too-many-listeners.js' },