a11y-test.js

import React from 'react';
import { renderToString } from 'react-dom/server';
import { axe, toHaveNoViolations } from 'jest-axe';
import Component from '/path';

expect.extend(toHaveNoViolations);

it('should have no a11y violations', async () => {
  const wrapper = renderToString(<Component />);
  const results = await axe(wrapper);
  expect(results).toHaveNoViolations;
});