Test: Fix TapReporter test to cover and use corrent 'internal' stack example

This was still an example of internal stacks as used by Node 12-14.
That's insignificant for the most part, except for the greying feature
recently added. By updating these fixtures, we'll improve test coverage.

Author: Krinkle

src/core/stacktrace.js

@@ -65,7 +65,7 @@ const fileName = qunitFileName();
  * - For errors in Node.js, format any remaining qunit.js and node:internal
  *   frames as internal (i.e. grey out).
  *
- * @param {string} Error#stack
+ * @param {string} stack Error#stack
  * @param {Function} formatInternal Format a string in an "internal" color
  * @param {string|null} [eToString] Error#toString() to help remove
  *  noise from Node.js/V8 stack traces.
@@ -83,6 +83,8 @@ export function annotateStacktrace (stack, formatInternal, eToString = null) {
   let initialInternal = true;
   for (let i = 0; i < frames.length; i++) {
     const frame = frames[i];
+    // Example of internal stack trace (Node 16+)
+    // "at wrapModuleLoad (node:internal/modules/cjs/loader:234:24)"
     const isInternal = ((fileName && frame.indexOf(fileName) !== -1) || frame.indexOf('node:internal/') !== -1);
     if (!isInternal) {
       initialInternal = false;
@@ -99,6 +101,7 @@ export function annotateStacktrace (stack, formatInternal, eToString = null) {
 export function extractStacktrace (e, offset) {
   offset = offset === undefined ? 4 : offset;
 
+  // Support: IE9, e.stack is not supported, we will return undefined
   if (e && e.stack) {
     const stack = e.stack.split('\n');
     // In Firefox and Safari, e.stack starts immediately with the first frame.

test/main/TapReporter.js

@@ -1,7 +1,7 @@
 function mockStack (error) {
   error.stack = ''
     + '    at Object.<anonymous> (/dev/null/test/unit/data.js:6:5)\n'
-    + '    at require (internal/helpers.js:22:18)\n'
+    + '    at require (node:internal/helpers.js:22:18)\n'
     + '    at /dev/null/src/example/foo.js:220:27';
   return error;
 }
@@ -35,6 +35,9 @@ QUnit.module('TapReporter', function (hooks) {
     },
     cyan: function (txt) {
       return '\x1B[36m' + txt + '\x1B[39m';
+    },
+    grey: function (txt) {
+      return '\x1B[90m' + txt + '\x1B[39m';
     }
   };
 
@@ -149,15 +152,15 @@ QUnit.module('TapReporter', function (hooks) {
 + '  severity: failed\n'
 + '  stack: |\n'
 + '        at Object.<anonymous> (/dev/null/test/unit/data.js:6:5)\n'
-+ '        at require (internal/helpers.js:22:18)\n'
++ '    ' + kleur.grey('    at require (node:internal/helpers.js:22:18)') + '\n'
 + '        at /dev/null/src/example/foo.js:220:27\n'
 + '  ...\n'
 + '  ---\n'
 + '  message: second error\n'
 + '  severity: failed\n'
 + '  stack: |\n'
 + '        at Object.<anonymous> (/dev/null/test/unit/data.js:6:5)\n'
-+ '        at require (internal/helpers.js:22:18)\n'
++ '    ' + kleur.grey('    at require (node:internal/helpers.js:22:18)') + '\n'
 + '        at /dev/null/src/example/foo.js:220:27\n'
 + '  ...\n'
     );
@@ -190,7 +193,7 @@ QUnit.module('TapReporter', function (hooks) {
 + '  severity: failed\n'
 + '  stack: |\n'
 + '        at Object.<anonymous> (/dev/null/test/unit/data.js:6:5)\n'
-+ '        at require (internal/helpers.js:22:18)\n'
++ '    ' + kleur.grey('    at require (node:internal/helpers.js:22:18)') + '\n'
 + '        at /dev/null/src/example/foo.js:220:27\n'
 + '  ...\n'
 + 'Bail out! ReferenceError: Boo is not defined\n'