Reproducing a ScalaCheck test run
scalacheck
Solution
As of today, this is possible (see scalacheck#263). There are some nice examples here: Simple example of using seeds with ScalaCheck for deterministic property-based testing.
In short, you can do:
propertyWithSeed("your property", Some("seed")) =
forAll { ??? }
and the seed will be printed when this property fails.
Problem
This was asked as a "bonus question" in https://stackoverflow.com/questions/12639454/make-scalacheck-tests-deterministic, but not answered: Is there a way to print out the random seed used by ScalaCheck, so that you can reproduce a specific test run? There is a hacky way: wrap a random generator to print its seed on initialization and pass it to `Test.Parameters`. Is there a better option?