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import ExampleTest.CanAddElement

import scala.language.reflectiveCalls
import org.scalatest.{FlatSpec, Matchers}

object ExampleTest {
  type CanAddElement = {def add(s: Any): Boolean}
}

class ExampleTest extends FlatSpec with Matchers {
  it should "add an element to the container" in {
    def add[T](container: CanAddElement)(element: T): Unit = {
      container.add(element)
    }

    val set = new java.util.HashSet[String]()
    add(set.asInstanceOf[CanAddElement])("3")
    set.contains("3") shouldEqual true

    val list = new java.util.LinkedList[String]()
    add(list.asInstanceOf[CanAddElement])("3")
    list.contains("3") shouldEqual true
  }
}