javascript - Node JS 验收测试的开发 API

Question

我已经为我的库创建了验收测试。当库发布时，它将使用尚未访问的外部 API 服务。所以我创建了一个模拟 json api 服务器，它返回测试所需的 JSON。为了让测试通过，我需要做的是在发出请求的文件中手动更改 API url。

我想知道是否有一种方法可以在运行验收测试时使用模拟 API url，并在不运行验收测试时恢复到实时 URL。下面是带有实时 URL 的代码片段。

return fetch('http://liveURL.com/api')
  .then(response => {
    if (response.status === 200) {
      return response.json()
        .then(myResponse => {
          var theResponse = myResponse.id;

          return theResponse;
        });
    } else {
      return response.json().then(error => {
        throw new Error(error.error);
      });
    }
  });

仅在运行验收测试时我想做的是更改 url，' http://liveURL.com/api '，我收到来自 ' http://localhost:3000/api 的请求'.

我正在使用的模拟服务器可以在这里找到:https://github.com/typicode/json-server

编辑:为了回答 Bens 的问题，这是我的 package.json，我试图在其中设置 NODE_ENV

{
  "name": "my-lib",
  "version": "0.1.0",
  "description": "",
  "main": "lib/myLib",
  "private": true,
  "scripts": {
    "lint": "gulp lint",
    "pretest": "npm run lint",
    "test": "istanbul cover node_modules/mocha/bin/_mocha -- --reporter spec \"test/unit/**/*.spec.js\"",
    "acceptance-test": "NODE_ENV=test cucumberjs",
    "build": "gulp build"
  },
  "author": "Me",
  "license": "ISC",
  "devDependencies": {
    "babel-preset-es2015": "^6.16.0",
    "babel-register": "^6.16.3",
    "babelify": "^7.3.0",
    "browserify": "^13.1.0",
    "chai": "^3.5.0",
    "chai-as-promised": "^5.3.0",
    "config-browserify": "^1.0.5",
    "cors": "^2.8.1",
    "cucumber": "^0.10.3",
    "eslint": "^3.0.1",
    "eslint-teamcity": "^1.1.0",
    "express": "^4.14.0",
    "gulp": "^3.9.1",
    "gulp-eslint": "^3.0.1",
    "gulp-sourcemaps": "^1.6.0",
    "gulp-uglify": "^2.0.0",
    "isomorphic-fetch": "^2.2.1",
    "istanbul": "v1.1.0-alpha.1",
    "jsdom": "^9.8.3",
    "json-server": "^0.9.1",
    "mocha": "^2.5.3",
    "mocha-jsdom": "^1.1.0",
    "mocha-teamcity-reporter": ">=0.0.1",
    "nock": "^9.0.0",
    "node-localstorage": "^1.3.0",
    "portscanner": "^2.1.0",
    "proxyquire": "^1.7.10",
    "selenium-server": "^2.53.0",
    "selenium-webdriver": "^2.53.2",
    "semver": "^5.3.0",
    "serve-static": "^1.11.1",
    "sinon": "^1.17.4",
    "sinon-chai": "^2.8.0",
    "vinyl-buffer": "^1.0.0",
    "vinyl-source-stream": "^1.1.0",
    "watchify": "^3.7.0"
  },
  "dependencies": {
    "config": "^1.21.0"
  }
}

我在 world.js 中创建了两个服务器。一台运行该库的服务器位于端口 23661 上，另一台服务器上的假 API 位于端口 3000 上。这可以在下面看到

'use strict';

const SeleniumServer = require('selenium-webdriver/remote').SeleniumServer;
 const webdriver = require('selenium-webdriver');
const server = new SeleniumServer(require('selenium-server').path, {port: 4444});
const serveStatic = require('serve-static');
const express = require('express');
const chaiAsPromised = require('chai-as-promised');
const chai = require('chai');
const jsonServer = require('json-server');
const cors = require('cors');

chai.should();
chai.use(chaiAsPromised);

const testServer = jsonServer.create();
const router = jsonServer.router('db.json');

testServer.use(cors());
testServer.options('*', cors());
testServer.use(router);
testServer.listen(3000);

const app = express();
const httpServerPort = 23661;
app.use(cors());
app.options('*', cors());
app.use(serveStatic('dist'));
app.use(serveStatic(__dirname + '/../page'));
app.use(serveStatic('node_modules/sinon/pkg'));
app.listen(httpServerPort);

server.start();

运行时，它会在 Firefox 浏览器中正确运行验收测试。

我尝试调用的文件

process.env.NODE_ENV

位于我的最小化库中，调用 myLib.min.js。

这是未压缩文件的一部分

'use strict';

const fetch = require('isomorphic-fetch');

module.exports = id => {
  var apiUrl = 'http://liveurl.com/api/' + id;

  if (process.env.NODE_ENV === 'development') {
    apiUrl = 'http://localhost:3000/api';
  }

  console.log(process.env.NODE_ENV);

    return fetch(apiUrl)
      .then(response => {
        if (response.status === 200) {
          return response.json()
            .then(myResponse => {
              var theResponse = myResponse.id;

              return theResponse;
            });
        } else {
          return response.json().then(error => {
            throw new Error(error.error);
          });
        }
      });
};

Answer 1

这通常可以通过使用 environment variables 来解决.

类似于:

var apiUrl = 'http://localhost:3000/api'
if (process.env.NODE_ENV === 'production') {
  apiUrl = 'http://liveurl.com/api';
}

return fetch(apiUrl)
  .then(response => {
  //... and so on

然后您将像这样启动您的应用程序(或运行您的测试)，为 NODE_ENV 填写适当的环境名称。常见的值为生产|测试|开发:

NODE_ENV=production node ./path/to/app.js