問題描述

我目前正在使用 Protractor 為我不起眼的 Angular 應(yīng)用程序編寫一些 e2e 測(cè)試.

I'm currently writing some e2e tests for my humble Angular app with Protractor.

我的應(yīng)用程序運(yùn)行良好，單元測(cè)試通過了所有測(cè)試，也使用了 e2e...直到這個(gè):

My app works fine, unit tests passes all, e2e used too... until this one:

appE2ESpec.js

describe('adding an item', function() {
  var items,
      addItemButton,
      startCount;

  beforeEach(function() {
    items = element.all(by.css('li.item'));
    addItemButton = element(by.id('addItemButton'));
    startCount = items.count();
  });

  it('should display a new item in list', function() {
    addItemButton.click();

    expect(items.count()).toEqual(startCount+1);
  });
});

這就是我編寫測(cè)試的方式，但是，

This is how I would have written my test but,

問題是: items.count() 返回一個(gè)承諾，我知道，但我無法強(qiáng)制 Protractor 解決它.所以我明白了:

The problem is: that items.count() returns a promise, I know that, but I can't manage to force Protractor to resolve it. So I get this:

Failures:

1) myApp adding an item should display a new item in list
  Message:
    Expected 6 to equal '[object Object]1'.

我的嘗試:

items.count().then(function(count) {
  startCount = count;
  //console.log(startCount) --> "6" Perfect!
});

但是最后得到了同樣的結(jié)果……我不能把expect放到then里面，我也想過.

But got the same result at the end... I can't put the expect into the then, I thought about that too.

• 我搜索了 Protractor GitHub 存儲(chǔ)庫(kù)問題、StackOverflow 和 Google AngularJs 組.

附錄:

console.log(startCount) 輸出:

{ then: [Function: then],
  cancel: [Function: cancel],
  isPending: [Function: isPending] }

我本可以編寫 .toEqual(6)，但我不想在每次需要更改應(yīng)用啟動(dòng)狀態(tài)時(shí)都重寫測(cè)試.

I could have written .toEqual(6) but I don't want to rewrite my test each time I need to change my app startup state.

有什么想法嗎?提前致謝！！

Any idea? Thanks in advance!!

推薦答案

你需要先解析promise，然后進(jìn)行斷言.

You need to resolve the promise and then do the assertion.

Protractor 將解析你傳遞給 expect() 的 Promise，但它不能在 Promise 中添加數(shù)字.你需要先解決promise的值:

Protractor will resolve the promise that you pass to expect(), but it cannot add a number to a promise. You need to resolve the value of the promise first:

beforeEach(function() {
  ...
  items.count().then(function(originalCount) {
    startCount = originalCount;
  });
});

it('should display a new item in list', function() {
  ...
  expect(items.count()).toEqual(startCount+1);
});

這篇關(guān)于如何使用量角器在 e2e 測(cè)試中預(yù)期元素的動(dòng)態(tài)計(jì)數(shù)的文章就介紹到這了，希望我們推薦的答案對(duì)大家有所幫助，也希望大家多多支持html5模板網(wǎng)！