message: Update Modal.test.tsx
diff: import { fireEvent, render, waitFor } from '@testing-library/react'
  import React from 'react'
  +import { findDOMNode } from 'react-dom'
  import { Modal, ModalProps } from './Modal'
  jest.mock('../../util/string')
  @@ -155,5 +156,5 @@ it('should accept "containerRef" prop and pass down to ModalContainer', () => {
  Testing.
  </Modal>
  )
  - expect(document.body.querySelector('[aria-modal="true"]').getAttribute('ref')).toBe(ref)
  + expect(document.body.querySelector('[aria-modal="true"]')).toBe(findDOMNode(ref.current))
  })
  