fix: address review comments

Author: vursen

packages/vaadin-template-renderer/test/vaadin-template-renderer.test.js

@@ -65,9 +65,6 @@ describe('vaadin-template-renderer', () => {
 
     it('should render the template after clearing the content', () => {
       component.$.content.innerHTML = '';
-
-      expect(component.$.content.textContent).to.equal('');
-
       component.render();
 
       expect(component.$.content.textContent).to.equal('foo');