mocha.js -r --require and custom assertion libraries

explanation.md

Explaination

I have been using mocha for a little while with the "should" assertion library on the node side and chai in the web browser. I determined I wanted to use chai for my server side js testing as well but I didn't want to require chai explicitly at the top of each file so I looked at the --require parameter for mocha and determined that I could leverage this to setup my testing framework as well as any custom matchers/other framework uils

The command I now use to run mocha is mocha -r ./test/support/setup test/my_stuff.test.js

In doing this - you no longer have to explicitly register chai/sinon

Thoughts? Good idea/bad idea - gotchas that I'm unaware of thus far?

test-support-setup.js

var chai = require('chai')
global.should = chai.should();
global.assert = chai.assert;

// Setup Sinon
global.sinon = require('sinon')
var sinonChai = require("sinon-chai");
chai.use(sinonChai);