t('click', {bubbles: true, composed: true});
      evMid.button = 1;
      var evLeft = new CustomEvent('click', {bubbles: true, composed: true});
      evLeft.button = 0;

      el.dispatchEvent(evMid);
      el.dispatchEvent(evLeft);

      assert.equal(el.stream.length, 1, 'only one tap');
    });
  });

  suite('Track', function() {
    test('Left Mouse Button Only', function() {
      var options = {bubbles: true, composed: true};
      var ev = new CustomEvent('mousedown', options);
      ev.clientX =