问无法获取通过单击按钮打开的新窗口页面的url

EN

it('Start test', () => { 
  element.all(by.buttonText('Launch Test')).click().then ( function() {
  browser.sleep(2000);
  browser.switchTo().window('Test');
  console.log('url ' + browser.getCurrentUrl());    
  expect(browser.getCurrentUrl()).
  toBe('https://localhost:44323/#/test/run/test_id');

 }); 
 });

Failed: no such window
(Session info: chrome=67.0.3396.99)
(Driver info: chromedriver=2.40.565498 (ea082db3280dd6843ebfb08a625e3eb905c4f5ab),platform=Windows NT 10.0.17134 x86_64)