量角器：已解决的承诺仍在被拒绝

Question

我是使用Protractor的初学者，并且正在使用它为Outlook中的加载项创建简单的测试自动化。
我目前正在测试以下步骤：

• 开启电子邮件
• 点击加载项按钮

问题是，在我使用browser.wait函数之一（openEmail）中，它返回的承诺在解决后被拒绝了。

Utility.js

function waitElement(method, { container, selector, timer }) {
  let _element = container ?
    container.$(selector) : $(selector);

  return browser.wait(
    protractor.ExpectedConditions[method](_element),
    1000 * (timer || 1),
    'Unable to wait for the element'

  ).then((() => _element));
}

isClickable(options) {
  return waitElement('elementToBeClickable', options);
}

outlook.js

let _ = require('./utility.js');

function openEmail(email) {
  _.isClickable({
    selector: email,
    timer: 15

  }).then(() => {
    console.log('OPEN EMAIL - CLICKABLE');
    el.click();

  }).catch(() => {
    throw Error('unable to click email.');
  });
}

function signIn(credentials) {
  let usernameField = $('#cred_userid_inputtext');
  let passwordField = $('#cred_password_inputtext');

  usernameField.sendKeys(credentials.username);
  passwordField.sendKeys(credentials.password);

  _.isClickable({
    selector: '#cred_sign_in_button',
    timer: 5

  }).then(el => {
    console.log('SIGN IN - CLICKABLE');
    el.click();

  }).catch(() => {
    throw Error('unable to click sign in button.');
  });
}

test.js

let outlook = require('./outlook.js');

describe('log in', () => {

  beforeAll(() => {
    browser.ignoreSynchronization = true;
    browser.get('https://outlook.office.com');

    // credentials & cssSelector are somewhere above the file
    outlook.signIn(credentials);
    outlook.openEmail(cssSelector);
  });

  it('should display log in', () => {
    // some tests here
  });

});

在我的终端中，它会SIGN IN - CLICKABLE和OPEN EMAIL - CLICKABLE但它还会显示openEmail引发的错误- unable to click email. 我很困惑，因为browser.wait返回一个承诺，而AFAIK不能解决已解决的承诺。

Answer 1

在您的openEmail(email)方法中，您的el似乎丢失了。 我认为您的代码应该是

 function openEmail(email) {
    _.isClickable({
selector: email,
timer: 15

}).then(el => {
console.log('OPEN EMAIL - CLICKABLE');
el.click();

}).catch(() => {
throw Error('unable to click email.');
});
}