From 91ed0f5b89637f3f2fc85394cc3cde9853aa4f94 Mon Sep 17 00:00:00 2001
From: armorbreak001 <contact@agentvote.cc>
Date: Tue, 7 Jul 2026 02:40:45 +0800
Subject: [PATCH] test_runner: display diagnostic messages in dot reporter

When using the dot reporter with coverage enabled, coverage failures
would silently exit with an error code but show no output explaining
the failure. This change collects and displays diagnostic messages
(including coverage warnings) after the test dots, similar to how
failed tests are displayed.

Fixes: #60884
Signed-off-by: armorbreak001 <contact@agentvote.cc>
---
 lib/internal/test_runner/reporter/dot.js | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/lib/internal/test_runner/reporter/dot.js b/lib/internal/test_runner/reporter/dot.js
index 45ff047bc4e5a0..fa29fdc73499fa 100644
--- a/lib/internal/test_runner/reporter/dot.js
+++ b/lib/internal/test_runner/reporter/dot.js
@@ -10,6 +10,7 @@ module.exports = async function* dot(source) {
   let count = 0;
   let columns = getLineLength();
   const failedTests = [];
+  const diagnostics = [];
   for await (const { type, data } of source) {
     if (type === 'test:pass') {
       yield `${colors.green}.${colors.reset}`;
@@ -18,6 +19,9 @@ module.exports = async function* dot(source) {
       yield `${colors.red}X${colors.reset}`;
       ArrayPrototypePush(failedTests, data);
     }
+    if (type === 'test:diagnostic') {
+      ArrayPrototypePush(diagnostics, data);
+    }
     if ((type === 'test:fail' || type === 'test:pass') && ++count === columns) {
       yield '\n';
 
@@ -33,6 +37,12 @@ module.exports = async function* dot(source) {
       yield formatTestReport('test:fail', test);
     }
   }
+  if (diagnostics.length > 0) {
+    yield `\n${colors.yellow}Diagnostics:${colors.white}\n\n`;
+    for (const diag of diagnostics) {
+      yield `${colors.yellow}! ${diag.message}${colors.reset}\n`;
+    }
+  }
 };
 
 function getLineLength() {