.instance() => ReactComponent

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

NOTE: With React 16 and above, instance() returns null for stateless functional components.

Returns

ReactComponent|DOMComponent: The retrieved instance.

Example

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

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

React 16.x

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

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

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

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

React 15.x

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

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

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

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