Angular 量角器在页面中找不到选择器

我有这样一个密码：

it('should go to summary page without sending the order', async () => {
    stepExecutor.startTimer();
    // redirects, rather than checking logging 
    await stepExecutor.executeStep(loginWithCustomer, {
      name: 'loginWithCustomer',
      description: 'Page: login'
    });
    // 
    await stepExecutor.executeStep(selectFirstSubscription, {
      name: 'selectFirstSubscription',
      description: 'Page: abo first'
    });
});

async function loginWithCustomer() {
  const page = createLoginPage(browser.params.space);
  await page.navigateTo(browser.params.login.url);
  await page.enterLogin(browser.params.login.username, browser.params.login.password);
  await page.redirect(`${browser.baseUrl}${ABO_FIRST_URI}`);
}

async function selectFirstSubscription() {
  const page = new AboFirstPage();
  await page.closeCookieNotification();
  await page.selectFirstSubscription();
}

export class AboFirstPage {
  async selectFirstSubscription() {
    await element(by.css('.button--primary')).click();
  }
}

它向我暴露了一个错误：

- Failed: No element found using locator: By(css selector, .button--primary)

Executed 1 of 1 spec (1 FAILED) in 5 secs.
[18:04:59] I/launcher - 0 instance(s) of WebDriver still running
[18:04:59] I/launcher - chrome #01 failed 1 test(s)
[18:04:59] I/launcher - overall: 1 failed spec(s)
[18:04:59] E/launcher - Process exited with error code 1

但在重定向到（函数loginWithCustomer）的页面上，会出现这样一个选择器。 元素（by.css（'.button--primary'））返回一个对象：

---

这段代码可能有什么错误？

让我们检查一下等待问题。将

sleep

添加到此函数：

async function selectFirstSubscription() {
  const page = new AboFirstPage();
  await page.closeCookieNotification();
  await browser.sleep(5000);
  await page.selectFirstSubscription();
}

若它可以工作，那个么您就有等待问题，在单击元素之前，您应该添加显式服务生。例如

wait ExpectedConditions.elementtobelickable（element）