import TestRenderer from 'react-test-renderer';function MyComponent() {
  return (
    <div>
      <SubComponent foo="bar" />
      <p className="my">Hello</p>
    </div>
  )}function SubComponent() {
  return (
    <p className="sub">Sub</p>
  );}const testRenderer = TestRenderer.create(<MyComponent />);const testInstance = testRenderer.root;expect(testInstance.findByType(SubComponent).props.foo).toBe('bar');expect(testInstance.findByProps({className: "sub"}).children).toEqual(['Sub']);