如何在量角器中正确链接承诺

Question

考虑以下片段：

        getApiEndpoints.billingCycle()
           .then(apiURL=>{
                return RestClient.doGet(apiURL);
            }).then(console.log(data))

在上面的代码片段中，getApiEndpoints.billingCycle() 和 RestClient.doGet(apiURL) 都 return 承诺。上面的代码只是挂起网络驱动程序，后来因超时错误而崩溃。

我在这里遗漏了什么吗？

更新：RestClient.doGet(apiURL)

function doGet(url){
var defer = Helper.getPromise().defer();
      request.get(url, (error, response, body) => {
        if (response&&(response.statusCode == 200 || response.statusCode == 201)) {
          defer.fulfill(JSON.parse(body));
        } else {
          defer.reject(error);
        }
        });
      return defer.promise;

}

我尝试了什么

let flow = browser.controlFlow();
           flow.execute(getApiEndpoints.billingCycle())
           .then((apiURL)=> console.log(apiURL))

让我 Failed: fn is not a function 错误...

Answer 1

Protractor 有自己的 control flow of Promises 并且默认情况下不链接非 Webdriver promise

所以有两种方法可以处理 this.I 个人更喜欢第二种，因为它利用了量角器配置提供的选项。

Insert a non-Web-driver Promise into Protractor Control flow.There beautiful post 如何实现它。
如果这与数据设置或执行的 pre-requisite 有关，我建议将其添加到 conf.js
的 onPrepare() 部分

You can specify a file containing code to run by setting onPrepare to * the filename string. onPrepare can optionally return a promise, which * Protractor will wait for before continuing execution. This can be used if * the preparation involves any asynchronous calls, e.g. interacting with * the browser. Otherwise Protractor cannot guarantee order of execution * and may start the tests before preparation finishes.

 onPrepare: function() {
       return getApiEndpoints.billingCycle()
           .then(apiURL=>{
           return RestClient.doGet(apiURL)
   }).then(
       // Any value you want to set with API response. Some examples below
       browser.profile = data.user.name;  
       browser.params.password = data.user.password;    

       // Or else get the complete JSON onto global browser and use it through-out test case
       browser.apiresponse = data;

       )
    },

Answer 2

Failed: fn is not a function

你应该传递一个函数给execute()（不要调用它）：

flow.execute(getApiEndpoints.billingCycle)

或者，如果需要传递参数：

flow.execute(function () {
    return getApiEndpoints.billingCycle(param1, param2);
});

如何在量角器中正确链接承诺

how to properly chain promises in protractor

promise

deferred

protractor

angular