Test actual serialization

Infrastructure taken from scala/scala#5278

Author: OlivierBlanvillain

tests/run/case-class-serializable.scala

@@ -1,6 +1,37 @@
-case class Foo()
+case class Foo(s: String)
 
 object Test {
-  def main(args: Array[String]): Unit =
-    assert(Foo().isInstanceOf[Serializable])
+  def main(args: Array[String]): Unit = {
+    val foo = Foo("bar")
+    assert(foo.isInstanceOf[Serializable])
+    assert(SerDes.serializeDeserialize[Foo](foo) == foo)
+  }
+}
+
+// From https://github.com/scala/scala/pull/5278
+object SerDes {
+  import java.io._
+
+  def assertNotSerializable(a: AnyRef): Unit = {
+    try {
+      serialize(a)
+      assert(false)
+    } catch {
+      case _: NotSerializableException => // okay
+    }
+  }
+
+  def serialize(obj: AnyRef): Array[Byte] = {
+    val buffer = new ByteArrayOutputStream
+    val out = new ObjectOutputStream(buffer)
+    out.writeObject(obj)
+    buffer.toByteArray
+  }
+
+  def deserialize(a: Array[Byte]): AnyRef = {
+    val in = new ObjectInputStream(new ByteArrayInputStream(a))
+    in.readObject
+  }
+
+  def serializeDeserialize[T <: AnyRef](obj: T) = deserialize(serialize(obj)).asInstanceOf[T]
 }