[gxml] Fixed GDocument.libxml_to_string(). Added unit tests

[Daniel Espinosa Ortiz <despinosa src gnome org>]

commit 4f1b8e807158c10eaa4f51585a320c4ef134fba3
Author: Daniel Espinosa <esodan gmail com>
Date:   Mon Feb 8 09:21:29 2016 -0600

    Fixed GDocument.libxml_to_string(). Added unit  tests

 gxml/GXmlDocument.vala  |    2 +-
 test/GDocumentTest.vala |   39 ++++++++++++++++++---------------------
 2 files changed, 19 insertions(+), 22 deletions(-)
---
diff --git a/gxml/GXmlDocument.vala b/gxml/GXmlDocument.vala
index d8c8930..5a82d5f 100644
--- a/gxml/GXmlDocument.vala
+++ b/gxml/GXmlDocument.vala
@@ -168,7 +168,7 @@ public class GXml.GDocument : GXml.GNode, GXml.Document
   public string libxml_to_string () {
     string buffer;
     doc->dump_memory (out buffer);
-    return buffer;
+    return buffer.dup ();
   }
   public virtual bool save (GLib.Cancellable? cancellable = null)
     throws GLib.Error
diff --git a/test/GDocumentTest.vala b/test/GDocumentTest.vala
index 4f734c0..b004b46 100644
--- a/test/GDocumentTest.vala
+++ b/test/GDocumentTest.vala
@@ -236,27 +236,24 @@ class GDocumentTest : GXmlTest {
                                assert (attr.value == "attrvalue");
                                //
                                //Test.message ("DOC libxml2:"+doc.libxml_to_string ());
-                       });/*
+                       });
                Test.add_func ("/gxml/gdocument/to_string", () => {
-                               GDocument doc = new GDocument.from_string ("<root />");
-                               assert (doc.to_string () == "<?xml version=\"1.0\"?>
-<Sentences>
-  <Sentence lang=\"en\">I like the colour blue.</Sentence>
-  <Sentence lang=\"de\">Ich liebe die T&#xFC;r.</Sentence>
-  <Authors>
-    <Author>
-      <Name>Fred</Name>
-      <Email>fweasley hogwarts co uk</Email>
-    </Author>
-    <Author>
-      <Name>George</Name>
-      <Email>gweasley hogwarts co uk</Email>
-    </Author>
-  </Authors>
-</Sentences>
-");
-                               // TODO: want to test with format on and off
-
-                       });*/
+                               GDocument doc = new GDocument.from_string ("<?xml version=\"1.0\"?>
+<Sentences><Sentence lang=\"en\">I like the colour blue.</Sentence><Sentence lang=\"de\">Ich liebe die 
T&#xFC;r.</Sentence><Authors><Author><Name>Fred</Name><Email>fweasley hogwarts co 
uk</Email></Author><Author><Name>George</Name><Email>gweasley hogwarts co 
uk</Email></Author></Authors></Sentences>");
+                               string s1 = doc.to_string ();
+                               string[] cs1 = s1.split ("\n");
+                               Test.message (s1);
+                               assert (cs1[0] == "<?xml version=\"1.0\"?>");
+                               assert (cs1[1] == "<Sentences><Sentence lang=\"en\">I like the colour 
blue.</Sentence><Sentence lang=\"de\">Ich liebe die 
T&#xFC;r.</Sentence><Authors><Author><Name>Fred</Name><Email>fweasley hogwarts co 
uk</Email></Author><Author><Name>George</Name><Email>gweasley hogwarts co 
uk</Email></Author></Authors></Sentences>");
+                       });
+               Test.add_func ("/gxml/gdocument/libxml_to_string", () => {
+                               GDocument doc = new GDocument.from_string ("<?xml version=\"1.0\"?>
+<Sentences><Sentence lang=\"en\">I like the colour blue.</Sentence><Sentence lang=\"de\">Ich liebe die 
T&#xFC;r.</Sentence><Authors><Author><Name>Fred</Name><Email>fweasley hogwarts co 
uk</Email></Author><Author><Name>George</Name><Email>gweasley hogwarts co 
uk</Email></Author></Authors></Sentences>");
+                               string s1 = doc.libxml_to_string ();
+                               string[] cs1 = s1.split ("\n");
+                               Test.message (s1);
+                               assert (cs1[0] == "<?xml version=\"1.0\"?>");
+                               assert (cs1[1] == "<Sentences><Sentence lang=\"en\">I like the colour 
blue.</Sentence><Sentence lang=\"de\">Ich liebe die 
T&#xFC;r.</Sentence><Authors><Author><Name>Fred</Name><Email>fweasley hogwarts co 
uk</Email></Author><Author><Name>George</Name><Email>gweasley hogwarts co 
uk</Email></Author></Authors></Sentences>");
+                       });
        }
 }