Question

我有一个简单的页面对象方法：

page.prototype.copyLink = function() {
  this.visit("https://myWebsite.com");
  this.login(); // once logged in, presented with list of elements
  return {
    firstCampaign: this.find('#el-1').getText(), //returns a promise
    secondCampaign: this.find('#el-2).getText() // returns a promise
  }
}

module.exports = page;

使用Jest和chai-as-promised我测试每个#el中的文字是否相同：

var page = require("./page");

it("Export link icon should link to export html page", function(){
   var copyLink =  page.copyLink();
   return copyLink.firstCampaign.should.eventually.equal(copyLink.secondCampaign);
});

出于某种原因，chai成功地从firstCampaign中提取了文本，但没有secondCampaign，因此我收到以下错误：

AssertionError: expected '##TEST STRING##' to equal { Object (flow_, stack_, ...) }

      at getBasePromise.then.then.newArgs (node_modules/chai-as-promised/lib/chai-as-promised.js:302:22)
      at ManagedPromise.invokeCallback_ (node_modules/selenium-webdriver/lib/promise.js:1384:14)
      at TaskQueue.execute_ (node_modules/selenium-webdriver/lib/promise.js:3092:14)
      at TaskQueue.executeNext_ (node_modules/selenium-webdriver/lib/promise.js:3075:27)
      at asyncRun (node_modules/selenium-webdriver/lib/promise.js:2935:27)
      at node_modules/selenium-webdriver/lib/promise.js:676:7
          at <anonymous>
      at process._tickCallback (internal/process/next_tick.js:188:7)

为什么chai不从第二个承诺中提取文本？

Answer 1

您的代码在等同比较之前只等待第一个承诺。

您需要等待执行all promises

var copyLink =  page.copyLink();
var actual;
return Promise.all([copyLink.firstCampaign, copyLink.secondCampaign]).then(results => results[0].should.equal(results[1])).should.be.fulfilled;

Chai-as-promise不提取文本值

1 个答案: