catching errors in once will still crash process

Author: sushantdhiman

test/integration/connection/test-invalid-credentials.js

@@ -0,0 +1,26 @@
+var common = require('../../common');
+var assert = require('assert');
+
+process.on('uncaughtException', function (err) {
+  assert.ifError(err);
+});
+
+var connection1 = common.createConnection({
+  username: 'wtf',
+  password: 'lol'
+});
+
+// error will NOT bubble up to process level if `on` is used
+connection1.on('error', function (err) {
+  assert.ok(err);
+});
+
+var connection2 = common.createConnection({
+  username: 'wtf',
+  password: 'lol'
+});
+
+// error will bubble up to process level if `once` is used
+connection2.once('error', function (err) {
+  assert.ok(err);
+});