.window.getAllHandles() 建議編輯

                    .window.getAllHandles([callback])
                

module.exports = {
 'get all window handles': function (browser) {
    browser.window.getAllHandles(function (result) {
      console.log('available window handles are:', result.value);
    });
  },

  'get all window handles with ES6 async/await': async function (browser) {
    const windowHandles = await browser.window.getAllHandles();
    console.log('available window handles are:', windowHandles);
  }
}