Jest spyOn function called

I'm trying to write a simple test for a simple React component, and I want to use Jest to confirm that a function has been called when I simulate a click with enzyme. According to the Jest docs, I should be able to use spyOn to do this: spyOn.

However, when I try this, I keep getting TypeError: Cannot read property '_isMockFunction' of undefined which I take to mean that my spy is undefined. My code looks like this:

import React, { Component } from 'react';
import logo from './logo.svg';
import './App.css';
class App extends Component {

  myClickFunc = () => {
      console.log('clickity clickcty')
  }
  render() {
    return (
      <div className="App">
        <div className="App-header">
          <img src={logo} className="App-logo" alt="logo" />
          <h2>Welcome to React</h2>
        </div>
        <p className="App-intro" onClick={this.myClickFunc}>
          To get started, edit <code>src/App.js</code> and save to reload.
        </p>
      </div>
    );
  }
}

export default App;

and in my test file:

import React from 'react';
import ReactDOM from 'react-dom';
import App from './App';
import { shallow, mount, render } from 'enzyme'

describe('my sweet test', () => {
 it('clicks it', () => {
    const spy = jest.spyOn(App, 'myClickFunc')
    const app = shallow(<App myClickFunc={spy} />)
    const p = app.find('.App-intro')
    p.simulate('click')
    expect(spy).toHaveBeenCalled()
 })
})

Anyone have an insight into what I'm doing wrong?