Add test of issue 392

Author: ashawley

shared/src/test/scala/scala/xml/NodeSeqTest.scala

@@ -0,0 +1,23 @@
+package scala.xml
+
+import scala.xml.NodeSeq.seqToNodeSeq
+
+import org.junit.Test
+import org.junit.Assert.assertEquals
+import org.junit.Assert.fail
+
+class NodeSeqTest {
+
+  @Test
+  def testAppend: Unit = { // Bug #392.
+    val a: NodeSeq = <a>Hello</a>
+    val b = <b>Hi</b>
+    a ++ <b>Hi</b> match {
+      case res: NodeSeq => assertEquals(2, res.size)
+      case res: Seq[Node] => fail("Should be NodeSeq") // Unreachable code?
+    }
+    val res: NodeSeq = a ++ b
+    val exp = NodeSeq.fromSeq(Seq(<a>Hello</a>, <b>Hi</b>))
+    assertEquals(exp, res)
+  }
+}