akka/akka-core

Error with Akka Typed BehaviorTestKit while using TimerScheduler

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#24,686 opened on Mar 8, 2018

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 (3 comments) (1 reaction) (0 assignees)Scala (13,277 stars) (3,547 forks)batch import
1 - triagedhelp wantedt:typed

Description

Trying to create a BehaviorTestKit using a behavior which spawns a timer within as given below

val behaviorTestKit = BehaviorTestKit(createBehavior)

private def createBehavior(): Behavior[MyMessage] = {
  Behaviors
    .withTimers[MyMessage](
      timerScheduler ⇒
        Behaviors
          .mutable[MyMessage](
            ctx =>
              new MyBehavior(
                ctx,
                timerScheduler,
                someInfo
            )
        )
    )
}

gives the following error:

An exception or error caused a run to abort: no scheduler 
java.lang.UnsupportedOperationException: no scheduler

It will be helpful if some stub implementation of scheduler could be supported like in case of contexts.

Contributor guide

Tech stack
scala
Domain
testingbackend
Issue type
bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
half day
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
stale
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
clear
Prerequisites
Akka TypedBehaviorTestKitTimerScheduler
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
30
Research direction
The issue requests a stub scheduler for BehaviorTestKit when using TimerScheduler. The implementation likely involves modifying BehaviorTestKit to provide a mock scheduler. Look at files like BehaviorTestKitImpl.scala and TimerSchedulerImpl.scala in the akka actor testkit typed module. A possible approach is to create a simple TimerScheduler stub that executes timers synchronously or tracks them for verification. Check existing PRs or comments for prior work.