app/components/StackedChart/__tests__/Rect-test.js
import React from 'react';
import renderer from 'react-test-renderer';
import Rect from '../Rect';
jest.mock('d3');
it('renders correctly', () => {
const tree = renderer.create(<Rect width={100} height={100} fill="test" y={3} />).toJSON();
expect(tree).toMatchSnapshot();
});