src/components/Start/__tests__/Start.spec.tsx
import * as React from 'react';
import * as ReactDOM from 'react-dom';
import { shallow, mount, render } from 'enzyme';
import { Start } from '../Start';
describe('Start', () => {
it('should have a class of start', () => {
const wrapper = shallow(<Start />);
expect(wrapper.is('.start')).toBe(true);
});
})