
        var input = Polymer.dom(container).querySelector('#i');
        var inputContent = Polymer.dom(container.root).querySelector('.input-content');
        MockInteractions.focus(input);
        requestAnimationFrame(function() {
          assert.isFalse(inputContent.classList.contains('label-is-highlighted'), 'label is not highlighted when input has focus and has null value');
          done();
        });
      });

      test('underline is colored when input is focused', function(done) {
        var