Rewrite tests to use a node friendly test suite

[raphaelokon]

The current implementation utilizes grunt-contrib-nodeunit.
I suggest to use a more node-friendly test suite like tap. There are many benefits to use a simple and concise test suite:

• https://remysharp.com/2016/02/08/testing-tape-vs-tap by @remy
• https://medium.com/javascript-scene/why-i-use-tape-instead-of-mocha-so-should-you-6aa105d8eaf4#.rt4fnsr8r by @ericelliott

[bmuenzenmeyer]

As we discussed, the unit tests are in need of a level up. I love this idea.

[raphaelokon]

Cheers … I already utilizing tap (node-tap) for the CLI test. Also: the current tests npm test run (or try to run) Travis locally. This should probably be changed for better dev experience.

[dbradf]

Hi,

I've added tap support to the project and converted over the of the test files to get started with this issue. I've opened the above pull request.

[raphaelokon]

That's great @dbradf I use tap on the patternlab-node-cli as well.