node.js 在测试环境中运行 mocha 测试？

Run mocha tests in test environment?

提问by Feech

I can't seem to tell mocha to run my test suite in the test environment.

我似乎无法告诉 mocha 在测试环境中运行我的测试套件。

app.js

应用程序.js

app.configure('test', function(){
  app.set('port', 3002);
});

test/some-test.coffee

测试/一些测试.coffee

app = require('../../app')

process.env.NODE_ENV = 'test'

describe 'some test', ->
  it 'should pass', ->

Since I'm requiring app, when I run the tests I expect to see

因为我需要应用程序，所以当我运行测试时，我希望看到

Express server listening on port 3002

Express server listening on port 3002

and instead I see

相反，我看到

Express server listening on port 3000

Express server listening on port 3000

Setting a different port number in a development configuration block in app.js yields

在 app.js 的开发配置块中设置不同的端口号会产生

Express server listening on port [whatever port I set in development block in app.js]

Express server listening on port [whatever port I set in development block in app.js]

I cannot get my tests to run in a test environment. Any suggestions?

我无法让我的测试在测试环境中运行。有什么建议？

回答by Vadim Baryshev

1. You need to define NODE_ENV before you require app.js:

   process.env.NODE_ENV = 'test'
   
   app = require('../../app')
   
   describe 'some test', ->
     it 'should pass', ->
   

2. You can't change listening port by app.set. There is only one way to set port - pass it into listenmethod. You can do something like this:

   var express = require('express');
   var app = express();
   
   app.get('/', function(req, res){
     res.send('hello world');
   });
   
   var port = 3000;
   
   app.configure('test', function(){
     port = 3002;
   });
   
   app.listen(port);
   

1. 您需要在需要之前定义 NODE_ENV app.js：

   process.env.NODE_ENV = 'test'
   
   app = require('../../app')
   
   describe 'some test', ->
     it 'should pass', ->
   

2. 您不能通过app.set. 只有一种设置端口的listen方法- 将其传递给方法。你可以这样做：

   var express = require('express');
   var app = express();
   
   app.get('/', function(req, res){
     res.send('hello world');
   });
   
   var port = 3000;
   
   app.configure('test', function(){
     port = 3002;
   });
   
   app.listen(port);
   

回答by Eat at Joes

I would take a different approach from Vadim. Using Vadim's example you could instead load environment settings based on your process.env.NODE_ENVvalue. I know there is another step in my approach, but it is cleaner, extensible, and will prevent the addition of test conditionals in your logic.

我会采取与 Vadim 不同的方法。使用 Vadim 的示例，您可以改为根据您的process.env.NODE_ENV值加载环境设置。我知道我的方法还有另一个步骤，但它更清晰、可扩展，并且可以防止在您的逻辑中添加测试条件。

This approach uses dotenv, then defining both a defaultand a testenvironment file in the root of the application. These files will allow you to reconfigure properties within your application without changing your JavaScript.

这种方法使用dotenv，然后在应用程序的根目录中定义一个default和一个test环境文件。这些文件将允许您在不更改 JavaScript 的情况下重新配置应用程序中的属性。

1. Add dotenv as a dependencyin your package.jsonfile then install the new packages into your node_modulesfolder:

   package.json

   {
     ...
     "dependencies": {
       ...
       "dotenv": "0.2.8"
     }
   }
   

   command line

   $ npm install
   

2. Change your app.jsso that the port is using an environment value set from the loaded .env file.

   // Load .env files from root based on the NODE_ENV value
   require('dotenv').load();
   
   var express = require('express');
   var app = express();
   
   app.get('/', function(req, res){
     res.send('hello world');
   });
   
   var port = process.env.port || 3000;
   -----------^
   
   app.listen(port);
   

3. Create two files in your folder root, .env& .env.test, just add the one line below. These files have simple key value pairs on each line which can be accessed when prefixed with process.env..

   .env

   port=3000
   

   .env.test

   port=3002
   

4. From the command line or when you call your tests I would set NODE_ENV:

   $ NODE_ENV=test mocha <TEST_FOLDER>/*.js
     ---------^
   

1. 将 dotenv 添加dependency到您的package.json文件中，然后将新软件包安装到您的node_modules文件夹中：

   包.json

   {
     ...
     "dependencies": {
       ...
       "dotenv": "0.2.8"
     }
   }
   

   命令行

   $ npm install
   

2. 更改您app.js的端口，以便端口使用从加载的 .env 文件中设置的环境值。

   // Load .env files from root based on the NODE_ENV value
   require('dotenv').load();
   
   var express = require('express');
   var app = express();
   
   app.get('/', function(req, res){
     res.send('hello world');
   });
   
   var port = process.env.port || 3000;
   -----------^
   
   app.listen(port);
   

3. 在文件夹根目录中创建两个文件.env& .env.test，只需在下面添加一行。这些文件的每一行都有简单的键值对，当前缀为process.env..

   .env

   port=3000
   

   .env.test

   port=3002
   

4. 从命令行或当您调用测试时，我会设置NODE_ENV：

   $ NODE_ENV=test mocha <TEST_FOLDER>/*.js
     ---------^
   

When you run the application in all other cases without setting NODE_ENV, the values in the default .envfile will be loaded into process.env.

当您在所有其他情况下运行应用程序而不进行设置时NODE_ENV，默认.env文件中的值将被加载到process.env.