test/files/scalacheck/quasiquotes/TypecheckedProps.scala


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import org.scalacheck._, Prop._, Gen._, Arbitrary._
import scala.reflect.runtime.universe._, Flag._, build.{Ident => _, _}

object TypecheckedProps extends QuasiquoteProperties("typechecked") {
  def original(tree: Tree) = tree match {
    case tt: TypeTree => Some(tt.original)
    case _            => None
  }
  def originals(trees: List[Tree]) = trees.flatMap(original)
  val int = ScalaDot(TypeName("Int"))
  val intint = List(int, int)

  property("tuple term") = test {
    val q"(..$elements)" = typecheck(q"(1, 2)")
    assert(elements ≈ List(q"1", q"2"))
  }

  property("tuple type") = test {
    val tq"(..$els0)" = typecheckTyp(tq"Unit")
    assert(els0.isEmpty)
    val tq"(..$els1)" = typecheckTyp(tq"(Int, Int)")
    assert(originals(els1) ≈ intint)
  }

  property("function type") = test {
    val tq"(..$argtpes) => $restpe" = typecheckTyp(tq"(Int, Int) => Int")
    assert(originals(argtpes) ≈ intint)
    assert(original(restpe).get ≈ int)
  }

  property("for/for-yield") = test {
    val enums = fq"x <- xs" :: fq"x1 = x + 1" :: fq"if x1 % 2 == 0" :: Nil
    val body = q"x1"
    val xs = q"val xs = List(1, 2, 3)"
    val q"$_; for(..$enums0) yield $body0" = typecheck(q"$xs; for(..$enums) yield $body")
    assert(enums0 ≈ enums)
    assert(body0 ≈ body)
    val q"$_; for(..$enums1) $body1" = typecheck(q"$xs; for(..$enums) $body")
    assert(enums1 ≈ enums)
    assert(body1 ≈ body)
  }
}