'use strict'; const common = require('../common'); const net = require('net'); const server = net.createServer((socket) => { socket.resume(); }).unref(); server.listen(common.mustCall(() => { const connect = (...args) => { const socket = net.createConnection(server.address().port, () => { socket.end(...args); }); }; const cb = common.mustCall(() => {}, 3); connect(cb); connect('foo', cb); connect('foo', 'utf8', cb); }));