Add tests

Author: odersky

tests/neg/enums.scala

@@ -0,0 +1,8 @@
+enum List[+T] {
+  case Cons(x: T, xs: List[T])
+  case Nil // error: illegal enum value
+}
+
+enum class X {
+  case Y // error: case not allowed here
+}

tests/run/enum-Color.check

@@ -0,0 +1,3 @@
+Red: 0
+Green: 1
+Blue: 2

tests/run/enum-Color.scala

@@ -0,0 +1,13 @@
+enum Color {
+  case Red
+  case Green
+  case Blue
+}
+
+object Test {
+  def main(args: Array[String]) =
+    for (color <- Color.values) {
+      println(s"$color: ${color.enumTag}")
+      assert(Color.valueOf(color.enumTag) eq color)
+    }
+}

tests/run/enum-List1.check

@@ -0,0 +1 @@
+Cons(1,Cons(2,Cons(3,Nil())))

tests/run/enum-List1.scala

@@ -0,0 +1,10 @@
+enum class List[T]
+object List {
+  case Cons(x: T, xs: List[T])
+  case Nil()
+}
+object Test {
+  import List._
+  val xs = Cons(1, Cons(2, Cons(3, Nil())))
+  def main(args: Array[String]) = println(xs)
+}

tests/run/enum-List2.check

@@ -0,0 +1 @@
+Cons(1,Cons(2,Cons(3,Nil)))

tests/run/enum-List2.scala

@@ -0,0 +1,11 @@
+enum class List[+T]
+object List {
+  case Cons(x: T, xs: List[T])
+  case Nil extends List[Nothing]
+}
+object Test {
+  import List._
+  val xs = Cons(1, Cons(2, Cons(3, Nil)))
+  def main(args: Array[String]) = println(xs)
+}
+