noodling towards a functional brain

Wednesday, August 17, 2011

The magical Specs/ScalaCheck defaultPrettyParams configuration implicit

When using Specs with ScalaCheck, I have occasionally found myself annoyed that, when a function under test threw an exception, ScalaCheck didn't show me enough of a stack trace to actually figure out what was going on. There is a means to configure this, but to the best of my knowledge it's essentially not documented anywhere. In any case, to get full stack traces in your spec, all that you need is this:
import org.specs._
import org.scalacheck._

class MySpec extends Specification with ScalaCheck {
  override val defaultPrettyParams = Pretty.Params(2)

  "your scalachecky specs here" should {
     //...
  }
}
The magical '2' in Pretty.Params(2) tells Scalacheck to spit out the full stack trace instead of just the error message from the exception.

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