Hi guys,
I've been writing some tests for my stream code and have run up against a
situation where I would like to have expectNextType. I've implemented this
myself with a pimp, but I'm wondering if there's a better way?
implicit class ProbeExtension[T](val p: Probe[T]) {
def expectNextType[A](implicit t: ClassTag[A]): p.Self = {
p.expectNextPF {
case a: A =>
case x => fail(s"Expected a $t type but got a
${x.getClass.getName}")
}
p
}
}
This is mostly useful when the 'A' in question is a derivation of Try[_].
I tend to write expectNextType[Failure[_]] in these cases. And, just to
give some context as to why I would want to do that: My flow components
might return a Try, which I then pass through a special handling / logging
flow, which transforms them to a List that is composed with a mapConcat.
So...
val flowReturningTry: Flow[T, Try[U], NotUsed] = ...
val handlingAndLogging: Flow[Try[U], U, NotUsed] = Flow[Try[U]].mapConcat {
/* List(u) or List(), depending on the Try */ }
val composed: Flow[T, U, NotUsed] =
flowReturningTry.mapConcat(handlingAndLogging)
Now, when testing flowReturningTry in isolation, the expectNextType is
useful.
Cheers and thanks,
Derek
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