message: Change sinon spyto sandbox spy
diff: import React from "react";
  -import Enzyme, { shallow, mount } from "enzyme";
  +import Enzyme, { mount, shallow } from "enzyme";
  import Adapter from "enzyme-adapter-react-16";
  import Button from "../button";
  import faker from "faker";
  @@ -22,7 +22,7 @@ describe("button specs", () => {
  });
  it("should call callback function when clicked", () => {
  - const spy = sinon.spy();
  + const spy = sandbox.spy();
  const wrapper = mount(<Button onClick={spy} />);
  wrapper.find("button").simulate("click");
  @@ -31,7 +31,7 @@ describe("button specs", () => {
  });
  it("should not call callback function when clicked but button is disabled", () => {
  - const spy = sinon.spy();
  + const spy = sandbox.spy();
  const wrapper = mount(<Button onClick={spy} disabled />);
  wrapper.find("button").simulate("click");
  @@ -40,19 +40,19 @@ describe("button specs", () => {
  });
  it("should be rendered with given primary variant prop", () => {
  - const wrapper = mount(<Button onClick={() => {}} variant="primary" />);
  + const wrapper = shallow(<Button onClick={() => {}} variant="primary" />);
  expect(wrapper.exists(".primary")).toEqual(true);
  });
  it("should be rendered with given large size prop", () => {
  - const wrapper = mount(<Button onClick={() => {}} size="large" />);
  + const wrapper = shallow(<Button onClick={() => {}} size="large" />);
  expect(wrapper.exists(".large")).toEqual(true);
  });
  it("should have className fluid when given fluid prop", () => {
  - const wrapper = mount(<Button onClick={() => {}} fluid />);
  + const wrapper = shallow(<Button onClick={() => {}} fluid />);
  expect(wrapper.exists(".fluid")).toEqual(true);
  });
  