Get, read and understand Kent Beck: "Test driven development by example". The rest will follow naturally.

[1] https://github.com/substack/tape

[2] http://www.catonmat.net/blog/writing-javascript-tests-with-t...

http://www.sustainabletdd.com/

One aha moment for me that's talked about here is to treat your tests more as a form of documentation and specification of how to use the system. They talk about how you should even do some basic tests to confirm enumerations and constants in the system as a way to be clear about their use.

You don't always have to be as thorough, but the mental shift from test to specification was helpful for me.

Edit: Unfortunately, if you download this podcast it's a bit out of order, so you want to read the blog and use it as a guide for which order to listen to things. They're in the process of writing a book about TDD and this blog is part of their process.

Misko Hevery's (also happens to be creator of angularjs!) Testability Explorer blog is also a great resource: http://misko.hevery.com/category/testability-explorer/

Longer story:

using npm to install sinon; shimming sinon in my karma browserify plugin config (`'sinon' : 'global:sinon'`)since it doesn't follow CommonJS; using browserify (and the karma browserify plugin) to require('sinon'); sinon is undefined after var sinon = require('sinon'). Might be something up with my config, but none of the other non-commonjs modules I shim (jquery, swfobject) have the same issues.