Function wait

test/unit/static/js/test_helpers.js:56–68

(duration, done, fn)

  // A function that acts like setTimeout, except with arguments reversed. This
  // is far more readable within tests.
  function wait(duration, done, fn) {
    var handler = function () {
      try {
        fn();
      } catch (e) {
        // Instead of relying on window.onerror to detect an error was
        // thrown (which is problematic in IE6-7), we invoke the callback
        // with an error the way Mocha expects.
        return done(e);
      }
    };
    return setTimeout(handler, duration);
  }
  window.wait = wait;

  function buildMessage() {