[gxml] Fixes on TwComment implementation

[Daniel Espinosa Ortiz <despinosa src gnome org>]

commit d2fc905ecb1388b2ce5351ea066ec49bf9dd01d5
Author: Daniel Espinosa <esodan gmail com>
Date:   Tue May 12 15:16:58 2015 -0500

    Fixes on TwComment implementation

 gxml/TwComment.vala     |    6 +++++-
 gxml/TwDocument.vala    |    5 +----
 test/GXmlTest.vala      |    1 +
 test/TwCommentTest.vala |   11 ++++++-----
 4 files changed, 13 insertions(+), 10 deletions(-)
---
diff --git a/gxml/TwComment.vala b/gxml/TwComment.vala
index 957d319..8d9247a 100644
--- a/gxml/TwComment.vala
+++ b/gxml/TwComment.vala
@@ -28,9 +28,13 @@ public class GXml.TwComment : GXml.TwNode, GXml.Comment
     requires (doc is GXml.TwDocument)
   {
     _doc = doc;
-    ((TwDocument) document).tw = ((TwDocument) doc).tw;
     _str = text;
   }
+  // GXml.Node
+  public override string @value {
+    get { return _str; }
+    set { _str = value; }
+  }
   // GXml.Comment
   public string str { get { return _str; } }
 }
diff --git a/gxml/TwDocument.vala b/gxml/TwDocument.vala
index 71c30bb..029dde6 100644
--- a/gxml/TwDocument.vala
+++ b/gxml/TwDocument.vala
@@ -46,9 +46,6 @@ public class GXml.TwDocument : GXml.TwNode, GXml.Document
   public GXml.Node create_comment (string text)
   {
     var c = new TwComment (this, text);
-    if (root == null)
-      return c;
-    root.childs.add (c);
     return c;
   }
   public GXml.Node create_element (string name)
@@ -185,7 +182,7 @@ public class GXml.TwDocument : GXml.TwNode, GXml.Document
         }
         if (n is GXml.Comment) {
 #if DEBUG
-    GLib.message (@"Starting Child Element: writting Text '$(n.value)'");
+    GLib.message (@"Starting Child Element: writting Comment '$(n.value)'");
 #endif
           size += tw.write_comment (n.value);
           if (size > 1500)
diff --git a/test/GXmlTest.vala b/test/GXmlTest.vala
index b3e640a..56a3ac1 100644
--- a/test/GXmlTest.vala
+++ b/test/GXmlTest.vala
@@ -73,6 +73,7 @@ class GXmlTest {
                Performance.add_tests ();
                TwElementTest.add_tests ();
                TwCDATATest.add_tests ();
+               TwCommentTest.add_tests ();
                TwDocumentTest.add_tests ();
 
                Test.run ();
diff --git a/test/TwCommentTest.vala b/test/TwCommentTest.vala
index 4854882..e5473ee 100644
--- a/test/TwCommentTest.vala
+++ b/test/TwCommentTest.vala
@@ -22,19 +22,20 @@
 
 using GXml;
 
-class TwComentTest : GXmlTest {
+class TwCommentTest : GXmlTest {
        public static void add_tests () {
                Test.add_func ("/gxml/tw-comment", () => {
                        try {
                                var d = new TwDocument ();
                                var r = d.create_element ("root");
                                d.childs.add (r);
-                               var cd = d.create_comment ("This is a comment");
-                               assert (cd.value == "This is a comment");
-                               d.root.childs.add (cd);
+                               var c = d.create_comment ("This is a comment");
+                               assert (c.value == "This is a comment");
+                               d.root.childs.add (c);
+                               GLib.message (@"$d");
                                assert (d.root.childs.size == 1);
                                string str = d.to_string ();
-                               assert ("<root><!This is a comment></root>" in str);
+                               assert ("<root><!--This is a comment--></root>" in str);
 #if DEBUG
                                GLib.message (@"$d");
 #endif