export default function () {
  return [
  {
    "id": "1",
    "title": "car",
    "items": [
        {
          "id": "01",
          "name": "Mazda"
        }, {
          "id": "02",
          "name": "Honda"
        }, {
          "id": "03",
          "name": "Maruti"
        }
    ]
  },
  {
    "id": "2",
    "title": "Bikes",
    "items": [
        {
          "id": "01",
          "name": "Ducatti"
        }, {
          "id": "02",
          "name": "Harley Davidson"
        }
    ]
  }
];
}

@@ -492,16 +492,277 @@
 %7D%0A    %5D%0A
+  %7D,%0A  %7B%0A    %22id%22: %223%22,%0A    %22title%22: %22Scooters%22,%0A    %22items%22: %5B%0A        %7B%0A          %22id%22: %2201%22,%0A          %22name%22: %22Bajaj%22%0A        %7D, %7B%0A          %22id%22: %2202%22,%0A          %22name%22: %22Scooty%22%0A        %7D, %7B%0A          %22id%22: %2202%22,%0A          %22name%22: %22Sunny%22%0A        %7D%0A    %5D%0A
   %7D%0A%5D;%0A%7D

Update stuffReducer.js