'use strict'; const common = require('../common'); const assert = require('assert'); const spawn = require('child_process').spawn; const child = spawn(process.execPath, ['-e', ` const server = require('net').createServer().listen(0); server.once('listening', server.close); `]); child.once('exit', common.mustCall(function(exitCode, signalCode) { assert.strictEqual(exitCode, 0); assert.strictEqual(signalCode, null); }));