akkadotnet/akka.net — pull request #341 by HCanber (2014-08-27 14:31:42+00:00)
Title: Add BlackHoleActor & EchoActor to TestKit

_BlackHoleActor_ is an actor that silently accepts any messages to it.

_EchoActor_ forwards messages it receives to the TestKit's TestActor as
well as to the sender (can opt out) unless the sender is the TestActor.