app/components/GitHubButton/__tests__/index-test.js
import React from 'react';
import renderer from 'react-test-renderer';
import GitHubButton from '..';
it('renders correctly', () => {
// Set up a script tag in the document
document.body.innerHTML = `
<script></script>`;
const tree = renderer.create(<GitHubButton type="Fork" />).toJSON();
expect(tree).toMatchSnapshot();
});