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Showing content from https://enzymejs.github.io/enzyme/docs/api/ShallowWrapper/instance.html below:

instance() · Enzyme

Returns the single-node wrapper's node's underlying class instance; this in its methods.

NOTE: can only be called on a wrapper instance that is also the root instance. With React 16 and above, instance() returns null for stateless functional components.

ReactComponent|DOMComponent: The retrieved instance.

function Stateless() {
  return <div>Stateless</div>;
}

class Stateful extends React.Component {
  render() {
    return <div>Stateful</div>;
  }
}

test('shallow wrapper instance should be null', () => {
  const wrapper = shallow(<Stateless />);
  const instance = wrapper.instance();

  expect(instance).to.equal(null);
});

test('shallow wrapper instance should not be null', () => {
  const wrapper = shallow(<Stateful />);
  const instance = wrapper.instance();

  expect(instance).to.be.instanceOf(Stateful);
});

test('shallow wrapper instance should not be null', () => {
  const wrapper = shallow(<Stateless />);
  const instance = wrapper.instance();

  expect(instance).to.be.instanceOf(Stateless);
});

test('shallow wrapper instance should not be null', () => {
  const wrapper = shallow(<Stateful />);
  const instance = wrapper.instance();

  expect(instance).to.be.instanceOf(Stateful);
});

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