[CCA-Diversity] Add tests

[nickbalestra]

As per the work done in the 1-fit-all flavor, only within jest

[jvanbruegge]

What is the benefit if using Jest? I looked at the docs and cannot really find one, automocking is something that i dont want too. In cycle all functions (should) are referential transperant, so no need for mocking anything
Jest looks cool for imperative React code, but i dont think there is a big gain for cycle

[nickbalestra]

Jest is just built on top of jasmine, I don't think that it's value is for react only. I also think that imperative code is not really an argument here. (btw automocking is not on by default since v 14 if i remember right). Few things that comes to my mind:

• Test are run in parallel, therefore is fast.
• Failing test run first
• Snapshots could be valuable in cycle as well
• custom matchers are pretty awesome, and I think we could definitely write some good custom matchers for cycle apps.

[jvanbruegge]

Didn't know about the parallel and the custom matchers, yes, that could indeed be nice