   var foo = app.$.foo;
    var div = foo.$.div;
    div.dispatchEvent(new CustomEvent('click', {bubbles: true, composed: true}));
    assert.equal(app._testLocalTarget, app, 'app local target');
    assert.equal(app._testRootTarget, div, 'app root target');
    assert.equal(foo._testLocalTarget, foo, 'foo local target');
    assert.equal(foo._testRootTarget, div, 'foo root target');
    let touches = [{
      clientX: 0,
      clientY: 0,
      identifier: 1,
      // target is set to the element with `add