Testing Hooks with Jooks.js

import init from 'jooks';

describe('Testing a custom hook', () => {
  const jooks = init(() => useLoadActivity());

  it('Should load activities properly', async () => {
    // By default, before it has a change to load anything, the hook
    // will return a null
    let result = jooks.run();
    expect(result.activity).toBeNull();
    // Then we wait for the component to "mount", essentially giving
    // it time to resolve the effect and load the data
    await jooks.mount();
    result = jooks.run(); // We run the hook again to update the result
    expect(result.activity).not.toBeNull();
    expect(result.activity!.activity).toBe('Foo');
    // Then we call the next() callback
    await result.next();
    result = jooks.run(); // We run the hook again to update the result
    expect(result.activity).not.toBeNull();
    expect(result.activity!.activity).toBe('Bar');
  });
});