sertComputed(e.$.child, '2px');
  });

  test('mixin redefinition resets old properties', function() {
    var e = document.createElement('x-redefine-one');
    document.body.appendChild(e);
    Polymer.flush();
    var div = e.$.two.$.three.$.div;
    assertComputed(div, '2px');
    assertComputed(div, '0px', 'height');
  });

  test('mixin redefinition applies to complicated hierarchies', function() {
    var e = document.createElement('order-gp');
    document.body.appendChild(e);
    Polymer.flush();
  