message: Fixes over code review feedbacks
diff: import Enzyme, { mount, shallow } from "enzyme";
  import Adapter from "enzyme-adapter-react-16";
  import React from "react";
  -import sinon from "sinon";
  +import sinon, { SinonSpy } from "sinon";
  import QuantitySelector from "../quantity-selector";
  Enzyme.configure({ adapter: new Adapter() });
  describe("quantity selector specs", () => {
  const sandbox = sinon.createSandbox();
  - let spyInc: any;
  - let spyDec: any;
  + let spyInc: SinonSpy;
  + let spyDec: SinonSpy;
  beforeEach(() => {
  spyInc = sandbox.spy();
  