How to check for an exception thrown in a future

[Christian Kaps]

Hi,

I would like to check if an exception was thrown in a future. I had the idea to wrap the exception with a FutureException in the recover method of a future, and then test first against the outer exception (FutureException) and then against the wrapped exception (SilhouetteException). But it doesn't work for me with Specs2. How could I achieve this with Specs2.

Thanks,

Christian

[Paulo "JCranky" Siqueira]

Why not simply evaluate the future and see if it results in a failure?

[]s,

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[]s,

Paulo "JCranky" Siqueira
youtube | site | lojinha

[Christian Kaps]

Hi,

Thanks for your answer. Consider the following method:

def process(request: Request): Future[Result] = {
request.param match {
case Some(param) => methodWhichReturnsFuture(param)
case None => throw new Exception()
}
}

No if I test the method I would use:

Await.result(process(request), 60.seconds) must throwA[Exception]

But now I can't distinguish which exception was thrown.

Is there an other method to check if the exception in the future was
thrown?

Thanks,
Christian

Am Samstag, den 26.04.2014, 13:45 -0300 schrieb Paulo "JCranky"
Siqueira:

[etorreborre]

Can you use the failed method?

deffailed: Future[Throwable]

If you block on this, you will get the thrown exception. You can test it like that:

    import scala.concurrent._

    import duration._

    val f = Future {throw new IllegalArgumentException("hey"); 1}.failed

    lazy val result = Await.result(f, 1.second)

    

    result must not(throwAn[Exception])

    result.rethrow must throwAn[IllegalArgumentException]("hey")

  

    implicit class Rethrow(t: Throwable) {

      def rethrow = {throw t; t}

    }

Eric.

[Christian Kaps]

Works like a charm.

Thanks,
Christian

Am Sonntag, den 27.04.2014, 16:29 -0700 schrieb etorreborre:
> Can you use the failed method?
>
>
> def

> failed: Future[Throwable]

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