Jest/Enzyme - TypeError: div.find is not a function

Below is a a little test file that I made for a React project that is using both Jest and Enzyme for testing. In this test, I'm simply trying to find an element in the component and see that it exists (as a truthy conditional). The whole point of this test wasn't just to see if the element existed, but I figured I'd start here. I'm very new to testing, so this syntax/implementation may be bonkers:

import React from 'react';
import ReactDOM from 'react-dom';

import Enzyme from 'enzyme';
import Adapter from 'enzyme-adapter-react-16';

import HamburgerIcon from './HamburgerIcon';

Enzyme.configure({ adapter: new Adapter() });

test('my first test -- will add better text here later', () => {
  const div = document.createElement('div');
  ReactDOM.render(<HamburgerIcon />, div);

  expect(div.find('.closed').exists()).toBeTruthy();

  ReactDOM.unmountComponentAtNode(div);
});

Running this results in this error:

TypeError: div.find is not a function

I originally built this test after seeing this Stack Overflow answer.

I'm not sure how to troubleshoot this, but I'm guessing that maybe I haven't properly "mounted" the component in this test? In the same Stack Overflow thread from the previous link, this answer shows how you would mount a component, but another comment on that answer says that another package needs to be installed in order to do that.

I sort of figured that using the div variable as the container to be searched with find would work, but am I wrong in thinking that?