  origCssBuild = window.ShadyCSS.cssBuild;
        assert.notEqual(origCss, undefined, 'nativeCss should be defined');
        assert.notEqual(origShady, undefined, 'nativeShadow should be defined');
        assert.equal(origCssBuild, 'shady', 'cssBuild should be defined');
        let script = document.createElement('script');
        script.src =
          '../node_modules/@webcomponents/shadycss/apply-shim.min.js';
        script.onerror = (err) => done(err);
        script.onload = () => {
          ass