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?
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.
There is no way to do this today. However, it will be implemented in the future, see https://github.com/rickynils/scalacheck/issues/67
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