message: [new feature] CouponList: add empty-image prop
diff: @@ -102,6 +102,16 @@ test('render empty coupon list', () => {
  expect(wrapper).toMatchSnapshot();
  });
  +test('empty-image prop', () => {
  + const wrapper = mount(CouponList, {
  + propsData: {
  + emptyImage: 'https://img.yzcdn.com/xxx.png'
  + }
  + });
  +
  + expect(wrapper).toMatchSnapshot();
  +});
  +
  test('exchange coupon', () => {
  const wrapper = mount(CouponList);
  const exchange = wrapper.find('.van-coupon-list__exchange');
  