End to End testing

[fabriciojs]

We already have a great unit/feature test suite in the CLI code itself, currently at ~94% coverage.

Would be very nice to have a full suite of tests for the CLI actually running and integrating with Docker, maybe on different environments/versions. Presets for example is a portion of our deliverables that would really leverage such testing.

[fabriciojs]

Investigating a bit about how to that, we find a couple of different approaches:

• there is a Node lib that focuses on testing CLI commands: https://github.com/vesln/nixt
• there is a now archived project which focuses on Bash testing - https://github.com/sstephenson/bats

BATS mention on TAP is interesting (http://testanything.org/).

Using vanilla bash could work as well... a small POC: https://github.com/kool-dev/kool/compare/master...fabriciojs:end-to-end-testing?expand=1