ventListener('iron-ajax-presend', function(e) {
            e.detail.options.url += '/test';
            e.detail.options.headers.authToken = 'a.b.c';
          });
          ajax.addEventListener('iron-ajax-request', function(e) {
            expect(e.detail.options.url).to.equal('/responds_to_get_with_json/test');
            expect(e.detail.options.headers.authToken).to.equal('a.b.c');
            done();
          });

          ajax.generateRequest();
        });
      });

      suite('Progress Tests'