I developed some nodejs applications which are at the moment in a stable state (change of specs is not frequent). I would like now to cover the critical parts of my code with tests. Do you have suggestions/experiences to share?
Mocha+Chai+SuperTest will be the best option for writing code in NodeJs http://developmentnow.com/2015/02/05/make-your-node-js-api-bulletproof-how-to-test-with-mocha-chai-and-supertest/
If you want to use any code coverage tool then Istanbul will be best to work with these modules