demo/src/components/Button/button.test.jsx
import React from 'react';
import { shallow } from 'enzyme';
import Button from './index';
test('renders without crashing', () => {
const button = shallow(<Button text="Dummy text" />);
expect(button.find('button')).toHaveLength(1);
expect(button.hasClass('main')).toBeTruthy();
expect(button.text()).toBe('Dummy text');
});