Output of Gen.choose() and .oneOf()

Question

When running the below test, Gen() gets printed out for both println statements.

Based on the ScalaCheck docs, I would've expected the output to be:

(number, number)

"Hello" or "World"

class TestScalaCheck extends FlatSpec {

    @author first test - https://github.com/rickynils/scalacheck/wiki/User-Guide
    "a test" should "print out Gen.choose(1, 100)" in {
        val myGen = for {
          n <- Gen.choose(10,20)
          m <- Gen.choose(2*n, 500)
        } yield (n,m)

        println(myGen)

        val c = Gen.oneOf("Hello", "World")
        println(c)
    }
}

Answer 1

Gen[T] is a generator of values (of type T), and this is the type of both myGen and c above. If you want to print out example values of what the generators can produce (wrapped as an Option), try println(myGen.sample) and println(c.sample).