', () => {
          const _warn = console.warn;
          const spy = console.warn = sinon.spy();

          sorter.path = 'foo.bar';
          click(sorter);
          console.warn = _warn;

          expect(spy.called).to.be.true;
        });

        it('should not warn about undefined values with defined parent property', () => {
          const _warn = console.warn;
          const spy = console.warn = sinon.spy();

          sorter.path = 'name.foo';
          click(sorter);
          console.warn = 