当所包含的应用服务器使用nodejs cluster.fork时，誓言单元测试已多次执行

Question

My app server uses node.js cluster API cluster.fork() to fork multiple child processes. This works fine.

However, when I try to use vows for unit test, the test also got run multiple times because of the call to cluster.fork() inside my app server; as I instantiate the server inside my test code, as follows:

basic-test.js

var vows = require('vows');
var MyAppServer = require('../my_app');

// start the server 
var app = MyAppServer.start();    

var suite = vows.describe('My Tests');
suite.discuss('connections API')
    .addBatch({ ... })
    .export(module);

How do I prevent test code to run multiple times in this case ? This test is included in npm test, so I need a way to instantiate my app server inside test itself.

Answer 1

At the top you can do

var cluster = require('cluster');

Then wrap the suite in an if :

if (cluster.isMaster) {
    var suite = ...
    ...
}

For more info on isMaster , check the documentation