Function factory

test/unit/test-runtime.js:748–751

()

      it('should register doc-service factory and install', function* () {
        let count = 0;
        function factory() {
          count++;
          return {str: 'A'};
        }
        const ampdoc = new AmpDocSingle(win);
        ampdoc.declareExtension('amp-ext', '0.1');
        ampdocServiceMock.expects('getAmpDoc').returns(ampdoc).atLeast(1);