[gxml] Ported tests SerializableTreeMap to TwDocument

[Daniel Espinosa Ortiz <despinosa src gnome org>]

commit c3feeab38485386c36682440d854ec9efb32c177
Author: Daniel Espinosa <esodan gmail com>
Date:   Tue May 12 10:12:49 2015 -0500

    Ported tests SerializableTreeMap to TwDocument

 test/SerializableGeeTreeMapTest.vala |    6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)
---
diff --git a/test/SerializableGeeTreeMapTest.vala b/test/SerializableGeeTreeMapTest.vala
index d3a1f13..839eae7 100644
--- a/test/SerializableGeeTreeMapTest.vala
+++ b/test/SerializableGeeTreeMapTest.vala
@@ -101,7 +101,7 @@ class SerializableGeeTreeMapTest : GXmlTest
         var o2 = new Space.named ("Small");
         c.set (o1.name, o1);
         c.set (o2.name, o2);
-        var doc = new xDocument ();
+        var doc = new TwDocument ();
         var root = doc.create_element ("root");
         doc.childs.add (root);
         c.serialize ((xNode) root);
@@ -210,14 +210,14 @@ class SerializableGeeTreeMapTest : GXmlTest
         c.storage = new Space.Collection ();
         c.storage.set (o1.name, o1);
         c.storage.set (o2.name, o2);
-        var doc = new xDocument ();
+        var doc = new TwDocument ();
         c.serialize (doc);
         if (doc.root == null) {
           stdout.printf (@"ERROR: doc have no root node\n$(doc)\n");
           assert_not_reached ();
         }
         if (doc.root.name != "spacecontainer") {
-          stdout.printf (@"ERROR: bad doc root node's name: $(doc.document_element.node_name)\n$(doc)\n");
+          stdout.printf (@"ERROR: bad doc root node's name: $(doc.root.name)\n$(doc)\n");
           assert_not_reached ();
         }
         var root = doc.root;