如何使用摩卡测试一个集群的Express应用程序？ [英] How to test a clustered Express app with Mocha?

问题描述

这是我的集群快速应用程序的简化版本：

Here is a simplified version of my cluster Express app:

/index.js

module.exports = process.env.CODE_COV
    ? require('./lib-cov/app')
    : require('./lib/app');

/lib/app.js

var cluster = require('cluster'),
    express = require('express'),
    app = module.exports = express.createServer();

if (cluster.isMaster) {
    // Considering I have 4 cores.
    for (var i = 0; i < 4; ++i) {
        cluster.fork();
    }
} else {
    // do app configurations, then...

    // Don't listen to this port if the app is required from a test script.
    if (!module.parent.parent) {
        app.listen(8080);
    }
}

/test/test1.js

/test/test1.js

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

app.listen(7777);

// send requests to app, then assert the response.

问题：

1. var app = require（'../');将不会在此集群环境中工作。哪些工作应用程序应该返回？是否应该返回集群对象而不是Express应用程序？


2. 现在，显然设置测试脚本中的端口将无法正常工作。您将如何将测试脚本中的端口设置到一组应用程序？


3. 如何将请求发送到此应用集群？

1. var app = require('../'); will not work in this cluster environment. Which of the worker apps should it return? Should it return the cluster object instead of an Express app?
2. Now, obviously setting the port in the test script will not work. How would you set a port within a test script to a cluster of apps?
3. How would you send requests to this cluster of apps?

我可以想到的唯一解决方案是有条件地关闭群集功能，并且只有在应用程序从测试脚本中请求时才运行一个应用程序（ if（module .parent.parent）... ）

The only solution I can think of is to conditionally turn off the clustering feature and run only one app if the app is requested from a test script (if (module.parent.parent) ...).

使用摩卡测试集群Express应用程序的任何其他方法？

Any other way to test a clustered Express app with Mocha?

推荐答案

自从我发布了这个问题以来已经很久了。因为没有人回答，我会自己回答这个问题。

It's been quite a long time since I have posted this question. Since no one has answered, I will answer to this question myself.

我一直保持 /index.js ：

module.exports = process.env.CODE_COV
    ? require('./lib-cov/app')
    : require('./lib/app');

在启动集群的 /lib/app.js 中，我有以下代码。简而言之，我只在非测试环境中启动集群。在测试环境中，集群不启动，但只有一个应用程序/工作程序本身启动，如 cluster.isMaster&&& ！module.parent.parent 条件。

In /lib/app.js which starts the cluster, I have the following code. In brief, I start the cluster only in non-test environment. In test environment the cluster is not started but only one app/worker itself is started as defined in the cluster.isMaster && !module.parent.parent condition.

var cluster = require('cluster'),
    express = require('express'),
    app = module.exports = express.createServer();

if (cluster.isMaster && !module.parent.parent) {
    // Considering I have 4 cores.
    for (var i = 0; i < 4; ++i) {
        cluster.fork();
    }
} else {
    // do app configurations, then...

    // Don't listen to this port if the app is required from a test script.
    if (!module.parent.parent) {
        app.listen(8080);
    }
}

在上述情况下！只有当应用程序未由测试脚本启动时，才会将module.parent.parent 评估为真实对象。

In the above case !module.parent.parent will be evaluated as a truthful object only if the application was not started by a test script.

1. module 是目前的 /lib/app.js 脚本。


2. module.parent 是其父 /index.js 脚本。


3. module.parent.parent如果应用程序是通过 node index.js 直接启动的，是未定义。 >
   
4. module.parent.parent 是测试脚本，如果应用程序是通过其中一个脚本启动的。

1. module is the current /lib/app.js script.
2. module.parent is its parent /index.js script.
3. module.parent.parent is undefined if the application was started directly via node index.js.
4. module.parent.parent is the test script if the application was started via one of the scripts.

因此，我可以安全地启动脚本，我可以在其中设置自定义端口。

Thus, I can safely start the script where I can set a custom port.

/ test /test1.js

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

app.listen(7777);

// send requests to app, then assert the response.

同时如果我需要实际运行应用程序，即不进行测试，那么我运行 node index.js ，它将启动应用程序集群。

At the same time if I need to run the application in real, i.e. not for testing, then I run node index.js and it will start up the cluster of applications.

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