What's your test environment for ES2015 node applications?

Hi there!

I just wanna know, what tools do you use to unit test your node applications (ES6).
Have you got any suggestions, additions or annotations? :)

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Currently I'm using mocha in combination with chai/expect, sinon and isparta:

To run tests, I use:

mocha ./test/** -c --compilers js:babel-core/register

and to get the test coverage, I use:

babel-node ./node_modules/.bin/isparta cover _mocha -- ./test/**

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So what's your opinion? I look forward to your replies :)