Javascript 如何在量角器/茉莉花测试中等待承诺？

我正在学习量角器（也就是说，量角器使用的Jasmine），出于某种原因，我需要等待继续测试的承诺。然而，我不知道如何做到这一点

让我们从量角器教程中获取代码并添加一些代码，然后添加一个简单的承诺（ES6样式），它什么都不做

describe('angularjs homepage todo list', function() {
  it('should add a todo', function() {
    browser.get('https://angularjs.org');

    element(by.model('todoList.todoText')).sendKeys('write first protractor test');
    element(by.css('[value="add"]')).click();

    var todoList = element.all(by.repeater('todo in todoList.todos'));

    Promise.resolve().then( () => {
      expect(todoList.count()).toEqual(3);
      expect(todoList.get(2).getText()).toEqual('write first protractor test');

      // You wrote your first test, cross it off the list
      todoList.get(2).element(by.css('input')).click();
      var completedAmount = element.all(by.css('.done-true'));
      expect(completedAmount.count()).toEqual(2);
    });
  });
});

这不起作用，因为这是答案

$ protractor conf.js
Using the selenium server at http://localhost:4444/wd/hub
[launcher] Running 1 instances of WebDriver
F

Failures:

  1) angularjs homepage todo list should add a todo
   Message:
     Error while waiting for Protractor to sync with the page: "angular could not be found on the window"
   Stacktrace:
     undefined

Finished in 0.212 seconds
1 test, 1 assertion, 1 failure

[launcher] 0 instance(s) of WebDriver still running
[launcher] chrome #1 failed 1 test(s)
[launcher] overall: 1 failed spec(s)
[launcher] Process exited with error code 1

---

我该怎么做才能让它工作呢？

我用以下方法解决了它：

• 首先，使用jasmine2作为框架，而不是writin使用jasemine

framework:'jasmine2'

到

conf.js

• 像这样编辑文件

  var flow = browser.flow()
  
  describe('angularjs homepage todo list', function() {
      it('should add a todo', function() {
      browser.get('https://angularjs.org');
  
      element(by.model('todoList.todoText')).sendKeys('write first protractor test');
      element(by.css('[value="add"]')).click();
  
      var todoList = element.all(by.repeater('todo in todoList.todos'));
  
      flow.execute(function(){Promise.resolve()});
      // or, more ES6-y version
      // flow.execute(() => Promise.resolve());
  
      expect(todoList.count()).toEqual(3);
      expect(todoList.get(2).getText()).toEqual('write first protractor test');
  
      // You wrote your first test, cross it off the list
      todoList.get(2).element(by.css('input')).click();
      var completedAmount = element.all(by.css('.done-true'));
      expect(completedAmount.count()).toEqual(2);
  
    });
  });
  

---

Jasmine实际上是将expect中的承诺“链接”在一起，这很方便地解决了我的问题。

我通过以下方式解决了这个问题：

• 首先，使用jasmine2作为框架，而不是writin使用jasemine

framework:'jasmine2'

到

conf.js

• 像这样编辑文件

  var flow = browser.flow()
  
  describe('angularjs homepage todo list', function() {
      it('should add a todo', function() {
      browser.get('https://angularjs.org');
  
      element(by.model('todoList.todoText')).sendKeys('write first protractor test');
      element(by.css('[value="add"]')).click();
  
      var todoList = element.all(by.repeater('todo in todoList.todos'));
  
      flow.execute(function(){Promise.resolve()});
      // or, more ES6-y version
      // flow.execute(() => Promise.resolve());
  
      expect(todoList.count()).toEqual(3);
      expect(todoList.get(2).getText()).toEqual('write first protractor test');
  
      // You wrote your first test, cross it off the list
      todoList.get(2).element(by.css('input')).click();
      var completedAmount = element.all(by.css('.done-true'));
      expect(completedAmount.count()).toEqual(2);
  
    });
  });
  

Jasmine实际上是将expect中的承诺“链接”在一起，这很方便地解决了我的问题