request-promise + co API 在量角器测试中触发

Question

我想通过量角器测试调用 module.api.create。参考这个解决方案： - 我正在像这样使用请求承诺 + co:-

//api/module1.js
var co = require('co');
var rp = require('request-promise');

exports.create =  co(function* def() {
    var response, token;
    urlLogin.body.username = username;
    response = yield rp(urlLogin);
    //extract token and run other APIs
    ...
}).catch(err => console.log);

和

//api/api.js 
var module1= require('./module1'),
exports.module1= function (){
  return module1;
};

在我的 Spec/Test 中添加

api = require('../../api/api');
api.module1.create;

我面临的问题是即使没有调用 "api.module1.create;" 行，require 行 "api = require('../../api/api');" 也会在每次执行测试时自动调用创建

Answer 1

来自co README:

co@4.0.0 has been released, which now relies on promises. It is a stepping stone towards the async/await proposal. The primary API change is how co() is invoked. Before, co returned a "thunk", which you then called with a callback and optional arguments. Now, co() returns a promise.

我相信您正在寻找 co.wrap，其中 returns 一个执行生成器的函数和 returns 一个 promise（这个函数也可能被称为 thunk）。仅使用 co 急切地执行生成器和 returns 执行生成器的结果。

const co = require('co')

co(function* () {
  // this will run
  console.log('hello from plain co!')
})

co.wrap(function* () {
  // this won't run because we never call the returned function
  console.log('hello from wrapped co 1!')
})

const wrappedfn = co.wrap(function* () {
  // this runs because we call the returned function
  console.log('hello from wrapped co 2!')
})

wrappedfn()

你也可以自己包装一个函数，它和co.wrap做同样的事情，然后让你做更多的事情。

exports.create = function() {
  return co(function* () {
    // this will run only when exports.create is called
    console.log('hello from plain co!')
  })
  // If you want to do stuff after and outside the generator but inside the enclosing function
  .then(...)
}

request-promise + co API 在量角器测试中触发

request-promise + co API trigger in protractor test

javascript

generator

require

protractor