intro to scalacheck gens

gens.scala

import org.scalacheck.Gen

//Gen a long
val genLong = Gen.posNum[Long]

// Gen a string
val genString = Gen.alphaChar

//Gen random length list of longs
val genList = Gen.listOf(Gen.posNum[Long])

// Gen from a list of hard coded strings
val genFriendName =
  Gen.oneOf("chrissy", "chandler", "mike", "sasha", "alex")

case class Friend(age: Long, name: String)

val genFriend = 
  for {
    age <- Gen.posNum[Long]
    name <- genFriendName
  } yield { Friend(age, name) }


scala> genLong.sample
res6: Option[Long] = Some(48)

scala> genString.sample
res7: Option[Char] = Some(r)

scala> genList.sample
res8: Option[List[Long]] = Some(List(1, 71, 99, 6, 53, 65, 18, 68, 13, 70, 5, 95, 51, 61, 51, 47, 57, 30, 81, 26, 41, 18, 15, 68, 96))

scala> genFriendName.sample
res9: Option[String] = Some(chrissy)

scala> genFriend.sample
res10: Option[Friend] = Some(Friend(75,alex))