app/containers/BudgetGrid/__tests__/index-test.js
import React from 'react';
import renderer from 'react-test-renderer';
import { BudgetGrid } from '../index';
// mock nested component
jest.mock('containers/EntryFormRow');
it('renders correctly', () => {
const tree = renderer.create(<BudgetGrid transactions={[]} />).toJSON();
expect(tree).toMatchSnapshot();
});