Test / testOptions += {
  val baseDir = baseDirectory.value
  Tests.Setup { () =>
    IO.touch(baseDir / "setup")
  }
}

Test / testOptions += {
  val t = baseDirectory.value / "tested"
  val c = baseDirectory.value / "cleanup"
  Tests.Cleanup { () =>
    // assert(t.exists, "Didn't exist: " + t.getAbsolutePath)
    IO.delete(t)
    IO.touch(c)
  }
}