The following test currently fails: ```js 'use strict'; const assert = require('assert'); const channel = new MessageChannel(); channel.port2.onmessage = function(event) { assert.strictEqual(event.ports.length, 1); }; const channel2 = new MessageChannel(); channel.port1.postMessage('', [channel2.port1]); ``` Reference: https://html.spec.whatwg.org/multipage/comms.html#dom-messageevent-ports