Scala
Akka Actor Testing: TestKit, TestProbe, and akka-testkit Patterns
Akka actors are concurrent by nature — they communicate asynchronously through message passing, which makes traditional unit testing approaches fail. akka-testkit provides TestKit and TestProbe to write deterministic tests for actor behavior: message routing, state transitions, supervision strategies, and timing. This guide covers the classic Akka (untyped) testkit and Akka