npm test出错

test/faye.js 第6行：var iChatClient = require('../client/c');
这句话没看太懂是什么意思...

执行npm test的时候出现了一下错误

```
module.js:338
throw err;
^
Error: Cannot find module '../client/c'
at Function.Module._resolveFilename (module.js:336:15)
at Function.Module._load (module.js:278:25)
at Module.require (module.js:365:17)
at require (module.js:384:17)
at Object. (/Users/kivipc/workspace/openSource/fayeserver/test/faye.js:6:19)
at Module._compile (module.js:460:26)
at Object.Module._extensions..js (module.js:478:10)
at Module.load (module.js:355:32)
at Function.Module._load (module.js:310:12)
at Module.require (module.js:365:17)
at require (module.js:384:17)
at /Users/kivipc/workspace/openSource/fayeserver/node_modules/mocha/lib/mocha.js:192:27
at Array.forEach (native)
at Mocha.loadFiles (/Users/kivipc/workspace/openSource/fayeserver/node_modules/mocha/lib/mocha.js:189:14)
at Mocha.run (/Users/kivipc/workspace/openSource/fayeserver/node_modules/mocha/lib/mocha.js:422:31)
at Object. (/Users/kivipc/workspace/openSource/fayeserver/node_modules/mocha/bin/_mocha:398:16)
at Module._compile (module.js:460:26)
at Object.Module._extensions..js (module.js:478:10)
at Module.load (module.js:355:32)
at Function.Module._load (module.js:310:12)
at Function.Module.runMain (module.js:501:10)
at startup (node.js:129:16)
at node.js:814:3
npm ERR! Test failed. See above for more details.
```

麻烦大神解释下

Start with test/faye.js line 6 and inspect the referenced ../client/c path, then review the npm test entry point and the Mocha output. Determine why the required module cannot be resolved; done means the intended test module loads and npm test completes without this error.

Written by the indexing model from the issue text.