events: update and clarify error message

Update error message that's thrown when no error listeners are attached
to an emitter.

PR-URL: https://github.com/nodejs/node/pull/10387
Reviewed-By: Sam Roberts <vieuxtech@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Italo A. Casas <me@italoacasas.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Michaël Zasso <targos@protonmail.com>

1 files changed, 6 insertions, 2 deletions

diff --git a/test/parallel/test-event-emitter-errors.js b/test/parallel/test-event-emitter-errors.js
index 2b4a93ae98..be4f4007f0 100644
--- a/test/parallel/test-event-emitter-errors.js
+++ b/test/parallel/test-event-emitter-errors.js
@@ -5,6 +5,10 @@ const assert = require('assert');
 
 const EE = new EventEmitter();
 
-assert.throws(function() {
+assert.throws(() => {
   EE.emit('error', 'Accepts a string');
-}, /Accepts a string/);
+}, /^Error: Unhandled "error" event\. \(Accepts a string\)$/);
+
+assert.throws(() => {
+  EE.emit('error', {message: 'Error!'});
+}, /^Error: Unhandled "error" event\. \(\[object Object\]\)$/);