Tests

[Arttii]

I ended up moving to travis and coveralls, because it was just simpler to set up. I duplicated the drone config via docker-compose. It seems to work fine for now.

Not all tests are currently there. I will list them out here:

• [x] utils
• [x] states
• [x] interface
• [x] retry
• [x] exceptions
• [x] connection
• [x] subscription
• [x] executor
• [x] scheduler

Utils contains the zookeeper discovery, which I tested by killing one of the masters using docker-compose and waiting for some intervals in the middle. Seems like its working.

@kszucs Any thoughts?

[Arttii]

With the addition of tests for connection and reconnection I think we could even release this quite soon. The schedule and executor are mostly manual work to test.

[Arttii]

I am going to close this for now as I added all the tests, which were not super complicated to test.

Will open another tracking issue if improvements are required.