test: add common.mustCall test-dgram-listen-after-bind

Author: zhoujiamin

test/parallel/test-dgram-listen-after-bind.js

@@ -21,6 +21,7 @@
 
 'use strict';
 require('../common');
+const common = require('../common');
 const assert = require('assert');
 const dgram = require('dgram');
 
@@ -33,12 +34,12 @@ const timer = setTimeout(() => {
   socket.close();
 }, 100);
 
-socket.on('listening', () => {
+socket.on('listening', common.mustCall(() => {
   clearTimeout(timer);
   fired = true;
   socket.close();
-});
+}));
 
-socket.on('close', () => {
+socket.on('close', common.mustCall(() => {
   assert(fired, 'listening should fire after bind');
-});
+}));