test/test-worker.html

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>Fetch Worker Tests</title>
  <link rel="stylesheet" href="../node_modules/mocha/mocha.css" />
</head>
<body>
  <div id="mocha"></div>
  <script src="../node_modules/mocha/mocha.js"></script>

  <script>
    mocha.setup('tdd')

    var worker = new Worker('worker.js')

    worker.addEventListener('message', function(e) {
      switch (e.data.name) {
        case 'pass':
          test(e.data.title, function() {})
          break
        case 'pending':
          test(e.data.title)
          break
        case 'fail':
          test(e.data.title, function() {
            var err = new Error(e.data.message)
            err.stack = e.data.stack
            throw err
          })
          break
        case 'end':
          if (self.mochaPhantomJS) {
            mochaPhantomJS.run()
          } else {
            mocha.run()
          }
          break
      }
    })
  </script>
</body>
</html>