r testElement = document.createElement('x-project');
    testElement.textContent = 'Hello World';
    assert.equal(testElement.textContent, 'Hello World', 'textContent getter incorrect');
    if (checkUnpatchedDom) {
      flush();
      assert.equal(Polymer.TreeApi.Composed.getChildNodes(testElement)[1].textContent, 'Hello World', 'text content setter incorrect');
    }
    testElement = createEnabledElement('x-commented');
    assert.equal(testElement.root.textContent, '[]', 'text content getter with comm