Akka is an open-source toolkit and runtime simplifying the construction of concurrent and distributed applications on the JVM. It implements the actor model known from Erlang.

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Today we’ll talk about one of the most common communication patterns, which is publish/subscribe, and how to perform it in a distributed environments using Akka.NET.

Remember that actors interact only using message passing. In order to check actors behavior you can do it through the messages sent to them and back from them. So how do you test actors? You send them messages :) To test actors that communicate only with messages, you need to send it a message and get reply back and check it.