I was trying to unit test the [apple push notification library](https://github.com/argon/node-apn) when I got a global leak error trying to open up an APN connection. 

Is that a configuration error on my part or an error in node-apn or mocha?

I'm not sure I understand what checkGlobals is doing... is it just checking to see if any global variable are being set?

```
0) Feed "before all" hook:
   Error: global leak detected: hasCert
     at Runner.checkGlobals (/usr/lib/node_modules/mocha/lib/runner.js:96:21)
     at Runner.<anonymous> (/usr/lib/node_modules/mocha/lib/runner.js:41:44)
     at Runner.emit (events.js:64:17)
     at /usr/lib/node_modules/mocha/lib/runner.js:159:12
     at Hook.run (/usr/lib/node_modules/mocha/lib/runnable.js:114:5)
     at next (/usr/lib/node_modules/mocha/lib/runner.js:157:10)
     at Array.<anonymous> (/usr/lib/node_modules/mocha/lib/runner.js:165:5)
     at EventEmitter._tickCallback (node.js:126:26)

```