jboner/akka — comment on commit 57de4c969c59f7b726e08fe260a0596385399cb5
File: akka-actor/src/main/scala/akka/util/Duration.scala line 283
By rkuhn:

I share your feeling, which is why I say testkit is special: there are test facilities like Duration.dilated implemented within akka-actor, which is the source for this single one-off exception.