CapybaraGeneratorRefactor.scala

case class Capybara(name: String, age: Int, awesome: Boolean)
case class Dog(name: String, age: Int, awesome: Boolean)

object Generator {
  import scala.util.Random
  def generate[A](implicit gen: Generator[A]): A = gen.gen

  implicit val intGenerator = new Generator[Int]{
    override def gen: Int = Random.nextInt(50)
  }
  implicit val stringGenerator = new Generator[String]{
    override def gen: String = Random.nextString(10)
  }
  implicit val booleanGenerator = new Generator[Boolean]{
    override def gen: Boolean = Random.nextBoolean
  }
  implicit val capybaraGenerator = new Generator[Capybara] {
    override def gen: Capybara = Capybara(generate[String], generate[Int], generate[Boolean])
  }
  implicit val dogGenerator = new Generator[Dog] {
    override def gen: Dog = Dog(generate[String], generate[Int], generate[Boolean])
  }
}