iron-mod
Installs handy short cuts to debug command line applications like Mocha and much more with iron-node. Here is a list of supported apps.
I suggest the iron-node-process-exit-break plugin for maximum fun :O).
Deprecated package!
Read https://github.com/s-a/iron-node/blob/master/docs/DEBUG-NODEJS-COMMANDLINE-APPS.md#debug-script-calls to use a much smarter way.