Add unit test

[carsten-j]

Right now the only kind of test is done through script files. One could consider adding proper unit and/or integration tests.

[object]

Agree. We need both unit and integration tests. When it comes to unit tests, I'd like to use Akka.NET TestKit but of course we also need proper integration tests agains Rabbit queues.

[carsten-j]

I started working on adding unit tests using Akka.NET TestKit.

[object]

You may find useful some support F# code that I ported from Akkling project (https://github.com/Horusiath/Akkling), some examples of usage: https://github.com/object/AkkaSftpWorkshop.Tests/tree/master/Tests