@vergiss/chooks/es/hooks/usePageTitle/__tests__/index.test.js

React hooks library

import { act, renderHook } from '@testing-library/react-hooks';
import { usePageTitle } from '../index';
describe('usePageTitle', function () {
  it('should be defined', function () {
    expect(usePageTitle).toBeDefined();
  });
  it("should change document's title and restore while unmounting", function () {
    global.window.document.title = 'Hello';
    var hook = renderHook(function () {
      return usePageTitle('Hello World');
    });
    expect(global.window.document.title).toBe('Hello World');
    act(function () {
      hook.unmount();
    });
    expect(global.window.document.title).toBe('Hello');
  });
});