'use strict'; const common = require('../common'); const dgram = require('dgram'); const buf = Buffer.alloc(1024, 42); const socket = dgram.createSocket('udp4'); socket.send(buf, 0, buf.length, common.PORT, 'localhost'); // if close callback is not function, ignore the argument. socket.close('bad argument'); socket.on('close', common.mustCall(function() {}));