diff --git a/lib/internal/test_runner/reporter/spec.js b/lib/internal/test_runner/reporter/spec.js
index 2092d22e3fe77f..e3906a0392a32b 100644
--- a/lib/internal/test_runner/reporter/spec.js
+++ b/lib/internal/test_runner/reporter/spec.js
@@ -44,15 +44,27 @@ class SpecReporter extends Transform {
       assert(parent.type === 'test:start');
       const msg = parent.data;
       ArrayPrototypeUnshift(this.#reported, msg);
-      prefix += `${indent(msg.nesting)}${reporterUnicodeSymbolMap['arrow:right']}${msg.name}\n`;
+      prefix += `${indent(msg.nesting)}${
+        reporterUnicodeSymbolMap['arrow:right']
+      }${msg.name}\n`;
     }
     let hasChildren = false;
-    if (this.#reported[0] && this.#reported[0].nesting === data.nesting && this.#reported[0].name === data.name) {
+    if (
+      this.#reported[0] &&
+      this.#reported[0].nesting === data.nesting &&
+      this.#reported[0].name === data.name
+    ) {
       ArrayPrototypeShift(this.#reported);
       hasChildren = true;
     }
     const indentation = indent(data.nesting);
-    return `${formatTestReport(type, data, prefix, indentation, hasChildren)}\n`;
+    return `${formatTestReport(
+      type,
+      data,
+      prefix,
+      indentation,
+      hasChildren
+    )}\n`;
   }
   #handleEvent({ type, data }) {
     switch (type) {
@@ -70,10 +82,19 @@ class SpecReporter extends Transform {
       case 'test:stdout':
         return data.message;
       case 'test:diagnostic':
-        return `${reporterColorMap[type]}${indent(data.nesting)}${reporterUnicodeSymbolMap[type]}${data.message}${colors.white}\n`;
+        const diagnosticColor =
+          reporterColorMap[data.level] || reporterColorMap['test:diagnostic'];
+        return `${diagnosticColor}${indent(data.nesting)}${
+          reporterUnicodeSymbolMap[type]
+        }${data.message}${colors.white}\n`;
       case 'test:coverage':
-        return getCoverageReport(indent(data.nesting), data.summary,
-                                 reporterUnicodeSymbolMap['test:coverage'], colors.blue, true);
+        return getCoverageReport(
+          indent(data.nesting),
+          data.summary,
+          reporterUnicodeSymbolMap['test:coverage'],
+          colors.blue,
+          true
+        );
     }
   }
   _transform({ type, data }, encoding, callback) {
@@ -84,7 +105,9 @@ class SpecReporter extends Transform {
       callback(null, '');
       return;
     }
-    const results = [`\n${reporterColorMap['test:fail']}${reporterUnicodeSymbolMap['test:fail']}failing tests:${colors.white}\n`];
+    const results = [
+      `\n${reporterColorMap['test:fail']}${reporterUnicodeSymbolMap['test:fail']}failing tests:${colors.white}\n`,
+    ];
     for (let i = 0; i < this.#failedTests.length; i++) {
       const test = this.#failedTests[i];
       const formattedErr = formatTestReport('test:fail', test);