node_modules/stream-http/test/browser/webworker.js

var fs = require('fs')
var test = require('tape')
var UAParser = require('ua-parser-js')
var url = require('url')
var work = require('webworkify')

var browser = (new UAParser()).setUA(navigator.userAgent).getBrowser()
var browserName = browser.name
var browserVersion = browser.major
// Skip browsers with poor or nonexistant WebWorker support
var skip = ((browserName === 'IE' && browserVersion <= 10) ||
	(browserName === 'Safari' && browserVersion <= 5) ||
	(browserName === 'WebKit' && browserVersion <= 534) || // Old mobile safari
	(browserName === 'Android Browser' && browserVersion <= 4))

var reference = fs.readFileSync(__dirname + '/../server/static/browserify.png')

test('binary download in WebWorker', {
	skip: skip
}, function (t) {
	// We have to use a global url, since webworkify puts the worker in a Blob,
	// which doesn't have a proper location
	var testUrl = url.resolve(global.location.href, '/browserify.png')
	var worker = work(require('./lib/webworker-worker.js'))
	worker.addEventListener('message', function (ev) {
		var data = new Buffer(new Uint8Array(ev.data))
		t.ok(reference.equals(data), 'contents match')
		t.end()
	})
	worker.postMessage(testUrl)
})