Infinite shrinking when using inside and property based tests with filters

[Jason Steenstra-Pickens]

Hi,

I'm trying to use ScalaTest with property based tests.

My test looks something like this:

class MySpec extends FlatSpec

                     with Matchers

                     with PropertyChecks

                     with Inside {

  "inside" should "work with property based testing" in {

    forAll { (value: String) =>

      whenever(value.trim.nonEmpty) {

        println(value)

        val sut: Option[String] = None // Force a failure

        inside(sut) { case Some(thing) =>

          value shouldBe thing

        }

      }

    }

  }

}

In this example I have intentionally made the test fail. In my real test I was really hoping to use pattern matching since the actual type is not an Option but some other hierarchical case class and I don't want to use equality.

It seems that this gets stuck in a loop where it looks like it is trying to shrink the failure down. If I remove the whenever then it works as expected.

Shall I raise this as a bug? (I'm using ScalaTest 3.0.0)

Cheers,

Jason

[Bill Venners]

Hi Jason,

Sorry I missed the notification that you had posted this question. That does look like a bug, so please report it as an issue if you haven't already.

Bill

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