From edb224e7e406500560cb61c97ba471f9be290871 Mon Sep 17 00:00:00 2001
From: Xavier Stouder <xavier@stouder.io>
Date: Tue, 23 Dec 2025 20:32:21 +0100
Subject: [PATCH 1/5] test_runner: print info when test restarts

When using spec reporter and running test in watch mode, print an info
message containing the current datetime when tests restart.

Fixes: https://github.com/nodejs/node/issues/57206
---
 lib/internal/test_runner/reporter/spec.js | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/lib/internal/test_runner/reporter/spec.js b/lib/internal/test_runner/reporter/spec.js
index 9031025e57d930..97737b83a78868 100644
--- a/lib/internal/test_runner/reporter/spec.js
+++ b/lib/internal/test_runner/reporter/spec.js
@@ -106,6 +106,9 @@ class SpecReporter extends Transform {
         if (data.file === undefined) {
           return this.#formatFailedTestResults();
         }
+        break;
+      case 'test:watch:restarted':
+        return `\nRestarted at ${new Date().toLocaleTimeString()}\n`
     }
   }
   _transform({ type, data }, encoding, callback) {

From 15f309c767bb50a05defe0389688d4954d19b692 Mon Sep 17 00:00:00 2001
From: Xavier Stouder <xavier@stouder.io>
Date: Tue, 23 Dec 2025 21:36:02 +0100
Subject: [PATCH 2/5] lint fix

---
 lib/internal/test_runner/reporter/spec.js | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/lib/internal/test_runner/reporter/spec.js b/lib/internal/test_runner/reporter/spec.js
index 97737b83a78868..de7a1112d05e9f 100644
--- a/lib/internal/test_runner/reporter/spec.js
+++ b/lib/internal/test_runner/reporter/spec.js
@@ -5,6 +5,7 @@ const {
   ArrayPrototypePush,
   ArrayPrototypeShift,
   ArrayPrototypeUnshift,
+  Date,
 } = primordials;
 const assert = require('assert');
 const Transform = require('internal/streams/transform');
@@ -108,7 +109,7 @@ class SpecReporter extends Transform {
         }
         break;
       case 'test:watch:restarted':
-        return `\nRestarted at ${new Date().toLocaleTimeString()}\n`
+        return `\nRestarted at ${new Date().toLocaleTimeString()}\n`;
     }
   }
   _transform({ type, data }, encoding, callback) {

From a1c46dbd3bb7eb11aca5fe587089f9bd358ebff0 Mon Sep 17 00:00:00 2001
From: Xavier Stouder <xavier@stouder.io>
Date: Tue, 23 Dec 2025 21:55:33 +0100
Subject: [PATCH 3/5] use primordial

---
 lib/internal/test_runner/reporter/spec.js | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/lib/internal/test_runner/reporter/spec.js b/lib/internal/test_runner/reporter/spec.js
index de7a1112d05e9f..3acb9f79d568cc 100644
--- a/lib/internal/test_runner/reporter/spec.js
+++ b/lib/internal/test_runner/reporter/spec.js
@@ -5,7 +5,7 @@ const {
   ArrayPrototypePush,
   ArrayPrototypeShift,
   ArrayPrototypeUnshift,
-  Date,
+  DatePrototypeToLocaleString,
 } = primordials;
 const assert = require('assert');
 const Transform = require('internal/streams/transform');
@@ -109,7 +109,7 @@ class SpecReporter extends Transform {
         }
         break;
       case 'test:watch:restarted':
-        return `\nRestarted at ${new Date().toLocaleTimeString()}\n`;
+        return `\nRestarted at ${DatePrototypeToLocaleString(new Date())}\n`;
     }
   }
   _transform({ type, data }, encoding, callback) {

From 260cfd17c9e4021966efc6bb08a66535127da5ac Mon Sep 17 00:00:00 2001
From: Xavier Stouder <xavier@stouder.io>
Date: Thu, 25 Dec 2025 01:46:04 +0100
Subject: [PATCH 4/5] fix lint

---
 lib/internal/test_runner/reporter/spec.js | 1 +
 1 file changed, 1 insertion(+)

diff --git a/lib/internal/test_runner/reporter/spec.js b/lib/internal/test_runner/reporter/spec.js
index 3acb9f79d568cc..b109fed6e840b0 100644
--- a/lib/internal/test_runner/reporter/spec.js
+++ b/lib/internal/test_runner/reporter/spec.js
@@ -5,6 +5,7 @@ const {
   ArrayPrototypePush,
   ArrayPrototypeShift,
   ArrayPrototypeUnshift,
+  Date,
   DatePrototypeToLocaleString,
 } = primordials;
 const assert = require('assert');

From db711a06b27849e907a2386a4236d64e602578b0 Mon Sep 17 00:00:00 2001
From: Xavier Stouder <xavier@stouder.io>
Date: Thu, 25 Dec 2025 01:46:10 +0100
Subject: [PATCH 5/5] add test

---
 ...test-output-spec-reporter-watch-restart.mjs | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)
 create mode 100644 test/test-runner/test-output-spec-reporter-watch-restart.mjs

diff --git a/test/test-runner/test-output-spec-reporter-watch-restart.mjs b/test/test-runner/test-output-spec-reporter-watch-restart.mjs
new file mode 100644
index 00000000000000..d158375974c48b
--- /dev/null
+++ b/test/test-runner/test-output-spec-reporter-watch-restart.mjs
@@ -0,0 +1,18 @@
+import '../common/index.mjs';
+import { spec as SpecReporter } from 'node:test/reporters';
+import assert from 'node:assert';
+
+const reporter = new SpecReporter();
+let output = '';
+
+reporter.on('data', (chunk) => {
+  output += chunk;
+});
+
+reporter.write({
+  type: 'test:watch:restarted',
+});
+
+reporter.end();
+
+assert.match(output, /Restarted at .+/);