{
        grid.items = [];
        expect(grid.$.items.firstElementChild).to.have.property('hidden', true);

        const spy = sinon.spy();
        grid.cellClassNameGenerator = spy;
        expect(spy).to.not.be.called;
      });

      it('should not throw with extra whitespace in the result', () => {
        expect(() => grid.cellClassNameGenerator = (column, model) => ' foo  bar ').not.to.throw(Error);
        assertClassList(firstCell, ['foo', 'bar']);
      });
    });
  </script>

</body>
</html>
