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

update() · Enzyme

Syncs the enzyme component tree snapshot with the react component tree. Useful to run before checking the render output if something external may be updating the state of the component somewhere.

NOTE: can only be called on a wrapper instance that is also the root instance.

NOTE: this does not force a re-render. Use wrapper.setProps({}) to force a re-render.

ShallowWrapper: Returns itself.

class ImpureRender extends React.Component {
  constructor(props) {
    super(props);
    this.count = 0;
  }

  render() {
    this.count += 1;
    return <div>{this.count}</div>;
  }
}

const wrapper = shallow(<ImpureRender />);
expect(wrapper.text()).to.equal('0');
wrapper.update();
expect(wrapper.text()).to.equal('1');

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