How does Enzyme work together with Jest when testing React components?

I am using Enzyme with a create-react-app, and I'm a little confused as to how exactly they interplay. Am I using Enzyme API in my assertions, or Jest's, or a combination of both?

For instance, this is my test code:

import React from 'react';
import Console from './Console';
import {shallow} from 'enzyme';

it('renders', () => {
  const wrapper = shallow(<Console />);

  expect(wrapper.equals(<div id="console" />)).toBe(true);
});

.equals() seems to be an Enzyme API, but I can't find .toBe()` anywhere in Enzyme's API documentation.

On a broader note, how exactly do test runners, frameworks, and assertion libraries interact? I've read multiple articles and SO questions and answers, but I'm still not too sure. Thank you!