unit-testingscalatestscalacheckproperty-based-testing

Scalacheck, generator for lists between size 5 and 12

I can find many examples of setting maximum sizes for generators, but how do I generate lists between a min and max length?

Solution

  • A neat property about generators is they are composable, so you can simply compose a generator for the length of your list with a listOfN generator. 

    for {
  numElems <- Gen.choose(5, 12)
  elems <- Gen.listOfN(numElems, elemGenerator)
} yield elems