This DEV-only field was added in 836331ba5f69f2cc53b273ec073fae116db14302 by @sebmarkbage but it's not being used anymore to my knowledge.
render() {
        return <FunctionComponent {...this.props} />;
      }
    }
    const el = document.createElement('div');
    ReactDOM.render(<Parent name="A" />, el);
    expect(el.textContent).toBe('A');
    ReactDOM.render(<Parent name="B" />, el);
    expect(el.textContent).toBe('B');
  });
  it('should unmount stateless component', () => {
    const container = document.createElement('div');
    ReactDOM.render(<FunctionComponent name="A" />, container);
    expect(container.textContent).toBe('A');
    ReactDOM.unmountComponentAtNode(container);
    expect(container.textContent).toBe('');
  });
  it('should pass context thru stateless component', () => {
    class Child extends React.Component {