[gxml] Added TwComment Unit tests

[Daniel Espinosa Ortiz <despinosa src gnome org>]

commit 422ddd8041dc3f53274c13c592145b77b83042a5
Author: Daniel Espinosa <esodan gmail com>
Date:   Tue May 12 15:05:07 2015 -0500

    Added TwComment Unit tests

 test/Makefile.am        |    1 +
 test/TwCommentTest.vala |   50 +++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 51 insertions(+), 0 deletions(-)
---
diff --git a/test/Makefile.am b/test/Makefile.am
index dc169d5..ba2be4c 100644
--- a/test/Makefile.am
+++ b/test/Makefile.am
@@ -52,6 +52,7 @@ sources = \
        TwElementTest.vala \
        TwDocumentTest.vala \
        TwCDATATest.vala \
+       TwCommentTest.vala \
        $(NULL)
 
 gxml_test.vala.stamp: $(sources)
diff --git a/test/TwCommentTest.vala b/test/TwCommentTest.vala
new file mode 100644
index 0000000..4854882
--- /dev/null
+++ b/test/TwCommentTest.vala
@@ -0,0 +1,50 @@
+/* -*- Mode: vala; indent-tabs-mode: t; c-basic-offset: 2; tab-width: 2 -*- */
+/* TwCDATATest.vala
+ *
+ * Copyright (C) 2011-2015  Daniel Espinosa <esodan gmail com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors:
+ *      Daniel Espinosa <esodan gmail com>
+ */
+
+using GXml;
+
+class TwComentTest : GXmlTest {
+       public static void add_tests () {
+               Test.add_func ("/gxml/tw-comment", () => {
+                       try {
+                               var d = new TwDocument ();
+                               var r = d.create_element ("root");
+                               d.childs.add (r);
+                               var cd = d.create_comment ("This is a comment");
+                               assert (cd.value == "This is a comment");
+                               d.root.childs.add (cd);
+                               assert (d.root.childs.size == 1);
+                               string str = d.to_string ();
+                               assert ("<root><!This is a comment></root>" in str);
+#if DEBUG
+                               GLib.message (@"$d");
+#endif
+                       }
+                       catch (GLib.Error e) {
+#if DEBUG
+                               GLib.message (@"ERROR: $(e.message)");
+#endif
+                               assert_not_reached ();
+                       }
+               });
+       }
+}