React testing useContext with enzyme

I am trying to mock useContext following this article:

https://medium.com/7shifts-engineering-blog/testing-usecontext-react-hook-with-enzyme-shallow-da062140fc83

I understand that the best way to test a component that uses useContext is to mock the context itself.

I have implemented a solution that should be the same as the article but when I run my test I always get TypeError: Cannot destructure propertywarning` of 'undefined' or 'null'.

 const Alert = () => {
    > 6 |   const { alert } = useContext(AlertContext); // this is where error happens

`

AlertContext.js:

import React, { createContext, useState, useContext } from 'react';

export const AlertContext = createContext();

export const useAlertContext = () => useContext(AlertContext);

const AlertContextProvider = props => {
  const [alert, setAlert] = useState({
    text: '',
    msg: ''
  });

  const updateAlert = (text, msg) => {
    setAlert({
      text,
      msg
    });
  };
  return (
    <AlertContext.Provider value=>
      {props.children}
    </AlertContext.Provider>
  );
};

export default AlertContextProvider;

Alert.js (component):

import React, { useContext } from 'react';
import './Alert.scss';
import { AlertContext } from '../context/AlertContext';

const Alert = () => {
  const { alert } = useContext(AlertContext);



  return (
    <div className='alert'>
      <p>{alert.text}</p>
    </div>
  );
};

export default Alert;

Alert.js(text)

import React from 'react';
import { shallow } from 'enzyme';
import Alert from '../components/Alert';
import * as AlertContext from '../context/AlertContext';


describe('<Alert />', () => {
  test('it should mock the context', () => {
    const contextValues = { text: 'suca', msg: 'SUCCESS' };
    jest
      .spyOn(AlertContext, 'useAlertContext')
      .mockImplementation(() => contextValues);
    const wrapper = shallow(<Alert />);
    const element = wrapper.find('.alert');

    expect(element.length()).toBe(1);
  });
});