See the issue and the test case with original fix in https://github.com/facebook/react/pull/14802.

We'll need to fix it properly, see https://github.com/facebook/react/pull/14802#issuecomment-463277621.
render() {
        return <div />;
      }
    }
    class Fragment extends React.Component {
      render() {
        return [<div key="a" />, <span key="b" />, <SomeComponent />];
      }
    }
    const shallowRenderer = createRenderer();
    const result = shallowRenderer.render(<Fragment />);
    expect(result).toEqual([
      <div key="a" />,
      <span key="b" />,
      <SomeComponent />,
    ]);
  });
  it('should shallow render a React.fragment', () => {
    class SomeComponent extends React.Component {