Added two failing tests for serialization

Author: Joe Barnes

jvm/src/test/scala/scala/xml/SerializationTest.scala

@@ -0,0 +1,45 @@
+package scala.xml
+
+import java.io._
+
+import org.junit.Assert.assertEquals
+import org.junit.Test
+
+class SerializationTest {
+  def roundTrip[T](obj: T): T = {
+    def serialize(in: T): Array[Byte] = {
+      val bos = new ByteArrayOutputStream()
+      val oos = new ObjectOutputStream(bos)
+      oos.writeObject(in)
+      oos.flush()
+      bos.toByteArray()
+    }
+
+    def deserialize(in: Array[Byte]): T = {
+      val bis = new ByteArrayInputStream(in)
+      val ois = new ObjectInputStream(bis)
+      ois.readObject.asInstanceOf[T]
+    }
+
+    deserialize(serialize(obj))
+  }
+
+  @Test
+  def xmlLiteral: Unit = {
+    val n = <node/>
+    assertEquals(n, roundTrip(n))
+  }
+
+  @Test
+  def empty: Unit = {
+    assertEquals(NodeSeq.Empty, roundTrip(NodeSeq.Empty))
+  }
+
+  @Test
+  def implicitConversion: Unit = {
+    val parent = <parent><child></child><child/></parent>
+    val children: Seq[Node] = parent.child
+    val asNodeSeq: NodeSeq = children
+    assertEquals(asNodeSeq, roundTrip(asNodeSeq))
+  }
+}