This gist accompanies the UPDATED version of the medium article "Test hooks on 'keyboardDidShow' in React Native Functional Component"

updated_mycomponent.test.js

import * as React from 'react';
import {Keyboard} from 'react-native';
import {render, act, cleanup} from '@testing-library/react-native'; // a better testing framework for event triggering
import {MyComponent} from 'mycomponent.js';

describe('Test MyComponent', () => {
  afterAll(cleanup);

  test('Text shown by default', () => {
    const {queryByText} = render(<MyComponent />);
    expect(queryByText(/bear/i)).not.toBeNull();
  });

  test('When Keyboard shows up, text disappears; otherwise, text appears', () => {
    const {queryByText} = render(<MyComponent />);
    act(() => Keyboard.emit('keyboardDidShow'));
    expect(queryByText(/bear/i)).toBeNull(); // keyboard is up, text disappears
    act(() => Keyboard.emit('keyboardDidHide'));
    expect(queryByText(/bear/i)).not.toBeNull(); // keyboard is down, text appears
  });
});