I can answered my own question here. It pretty much just came down to my 
lack of knowledge around the streams API, which I hadn't used yet. Changing 
the test to this works perfectly:

test("test journal backwards compatibility", EndToEndTest) {
  val readJournal = PersistenceQuery(system).readJournalFor[LeveldbReadJournal](
    LeveldbReadJournal.Identifier)
  implicit val mat = ActorMaterializer()(system)
  val allPersistenceIDs = readJournal.currentPersistenceIds().map { pid =>
    val eventsForID = readJournal.currentEventsByPersistenceId(pid)
    val res = eventsForID.runWith(Sink.foreach { e => e.event })
    // Simply waiting for the result will blow up with an exception if we 
couldn't deserialize.
    Await.result(res, 300.millis)
  }
  Await.result(allPersistenceIDs.runWith(Sink.seq), 5.seconds)
}



On Wednesday, October 12, 2016 at 4:43:39 PM UTC-7, Spencer Judge wrote:
>
> Hello all,
>
> In order to test that no unaccounted-for serialization changes have happen 
> before we deploy our service, I need some way for us to *attempt* to 
> deserialize all currently stored events in our event journal and snapshots.
>
> Currently, we just use the local leveldb plugin with local snapshot 
> storage, which has been totally adequate for our purpose.
>
> I'm trying to do this by using a PersistenceQuery, but I'm totally unable 
> to get the persistence query to actually... return anything. My code is 
> pasted below. The things hidden behind the "PersistentTestKit" object just 
> handle some data cleaning before the tests, etc, and when I call 
> getNewConfig, that's just modifying the akka config to use the location of 
> the stored journal/snapshots we want to test against.
>
> As you can see, I added a simple persistent actor just to test if I could 
> get the query to return events from something not even related to the 
> existing data, and even it doesn't show up in the query (nothing does). 
> This is the output:
>
> Recover persisted a thing!  // As many times as I've already run the test, 
> as expected.
> Recover RecoveryCompleted
> Persisting a thing!
> Found persistence IDs:
> Found persistence IDs:
> Found persistence IDs:
>
> Clearly, I'm missing something, but I'm not sure what. If I inspect the 
> config given to the system, everything looks right. The storage locations 
> are right, the plugins are right, etc. Can someone point me in the right 
> direction?
>
> Alternatively, is there a better way to do this? I will happily do 
> something else entirely if PersistenceQuery isn't the right fit.
>
>
> object PersistCompatIT {
>   val persistBackupLoc = ".exported_state"
>   val dumpFile = new File(PersistentTestKit.findRoot(), 
> persistBackupLoc).getAbsoluteFile
>   val absPathToBackup = dumpFile.toPath.toString
>   val systemConfig = PersistentTestKit.getNewConfig(true, (cfg) => {
>     cfg.withValue("akka.persistence.snapshot-store.local.dir",
>                   ConfigValueFactory
>                     
> .fromAnyRef(s"$absPathToBackup/boxsrv-snapshots/local-snapshots"))
>       .withValue("akka.persistence.journal.leveldb.dir",
>                  
> ConfigValueFactory.fromAnyRef(s"$absPathToBackup/boxsrv-journal/leveldb-journal"))
>   })
>
>   val lamePersistActorID = "imastupidpersistactor"
>   class LamePersistActor extends PersistentActor {
>     override def receiveRecover: Receive = {
>       case m: Any => println(s"Recover $m")
>     }
>     override def receiveCommand: Receive = {
>       case 'whoapersist =>
>         println("Persisting a thing!")
>         persist("persisted a thing!") { _ => () }
>       case m: Any => println(s"Command $m")
>     }
>     override def persistenceId: String = lamePersistActorID
>   }
> }
>
> /**
>   * Tests backwards compatibility for journaling / snapshots
>   */
> class PersistCompatIT extends TestKit(ActorSystem("PersistCompatSys",
>                                                   
> PersistCompatIT.systemConfig)) with FunSuiteLike {
>
>   test("test journal backwards compatibility", EndToEndTest) {
>     val lameActor = system.actorOf(Props(new LamePersistActor))
>     lameActor ! 'whoapersist
>     Thread.sleep(1000)
>     val readJournal = 
> PersistenceQuery(system).readJournalFor[LeveldbReadJournal](
>       LeveldbReadJournal.Identifier)
>     implicit val mat = ActorMaterializer()(system)
>     for (i <- 1 to 3) {
>       Thread.sleep(2000)
>       val allPersistenceIDs = readJournal.allPersistenceIds()
>       val dafuq = 
> readJournal.eventsByPersistenceId(PersistCompatIT.lamePersistActorID)
>       println("Found persistence IDs:")
>       allPersistenceIDs.map { e =>
>         println(e)
>         e
>       }
>       dafuq.map { e =>
>         println(e.event)
>         e
>       }
>     }
>   }
> }
>
>
>

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