//import scala.concurrent._

//import scala.concurrent.duration._

//import ExecutionContext.Implicits.global

//import scala.language.postfixOps 

//import scala.language.reflectiveCalls

//lazy val f = Future {

  import CW8a._

  val EVIL_urban = SEQ(STAR(STAR(CHAR('a'))), CHAR('b'))

  //println("1")

  assert(ders(List.fill(5)('a'), EVIL_urban) == SEQ(SEQ(STAR(CHAR('a')),STAR(STAR(CHAR('a')))),CHAR('b')))

  //println("2")

  assert(ders(List('b'), EVIL_urban) == ONE)

  //println("3")

  assert(ders(List('b','b'), EVIL_urban) == ZERO)

  //println("4")

  assert(matcher(EVIL_urban, "a" * 5 ++ "b") == true)

  //println("5")

  assert(matcher(EVIL_urban, "b") == true)

  //println("6") 

  assert(matcher(EVIL_urban, "bb") == false)

  //println("7")

  assert(matcher("abc", "abc") == true)

  //println("8")

  assert(matcher(("ab" | "a") ~ (ONE | "bc"), "abc") == true)

  //println("9")

  assert(matcher(ONE, "") == true)

  //println("10")

  assert(matcher(ZERO, "") == false)

  //println("11")

  assert(matcher(ONE | CHAR('a'), "") == true)

  //println("12")

  assert(matcher(ONE | CHAR('a'), "a") == true)

//}

//Await.result(f, 90 second)