[gxml] GomDocument: new write_string()

[Daniel Espinosa Ortiz <despinosa src gnome org>]

commit 76123366c970d072fdd4617588f7e9037885798d
Author: Daniel Espinosa <esodan gmail com>
Date:   Fri May 5 11:43:46 2017 -0500

    GomDocument: new write_string()

 gxml/GomDocument.vala     |    7 +++++++
 test/GomDocumentTest.vala |   17 +++++++++++++++++
 test/GomElementTest.vala  |    7 ++++++-
 3 files changed, 30 insertions(+), 1 deletions(-)
---
diff --git a/gxml/GomDocument.vala b/gxml/GomDocument.vala
index 963a108..c45e345 100644
--- a/gxml/GomDocument.vala
+++ b/gxml/GomDocument.vala
@@ -128,6 +128,13 @@ public class GXml.GomDocument : GomNode,
     return parser.create_stream (null);
   }
   /**
+   * Serialize {@link GomDocument} to a string.
+   */
+  public string write_string () throws GLib.Error {
+    var parser = new XParser (this);
+    return parser.write_string ();
+  }
+  /**
    * Reads a file contents and parse it to document.
    */
   public void read_from_file (GLib.File file) throws GLib.Error {
diff --git a/test/GomDocumentTest.vala b/test/GomDocumentTest.vala
index b5d05e8..22ad703 100644
--- a/test/GomDocumentTest.vala
+++ b/test/GomDocumentTest.vala
@@ -526,5 +526,22 @@ class GomDocumentTest : GXmlTest {
                        var doc = new GomDocument ();
                        assert (doc.parent_node == null);
                });
+               Test.add_func ("/gxml/gom-document/write/string", () => {
+                       try {
+                               var d = new GomDocument ();
+                               var n = d.create_element ("Node") as GomElement;
+                               d.append_child (n);
+                               n.set_attribute ("name","value");
+                               var n2 = d.create_element ("Node2") as GomElement;
+                               n.append_child (n2);
+                               message (d.write_string ());
+                               string str = d.write_string ();
+                               assert ("<Node" in str);
+                               assert ("<Node name=\"value\"><Node2/></Node>" in str);
+                       } catch (GLib.Error e) {
+                   GLib.message ("Error: "+e.message);
+                   assert_not_reached ();
+                 }
+               });
        }
 }
diff --git a/test/GomElementTest.vala b/test/GomElementTest.vala
index 687f6b2..8a40607 100644
--- a/test/GomElementTest.vala
+++ b/test/GomElementTest.vala
@@ -226,9 +226,14 @@ class GomElementTest : GXmlTest  {
                                var n = new GomElement ();
                                n.initialize ("Node");
                                n.set_attribute ("name","value");
+                               var n2 = n.owner_document.create_element ("Node2") as GomElement;
+                               n.append_child (n2);
                                string str = n.write_string ();
                                assert ("<Node" in str);
-                               assert ("<Node name=\"value\"/>" in str);
+                               assert ("<Node name=\"value\"><Node2/></Node>" in str);
+                               str = n2.write_string ();
+                               assert ("<Node2/>" in str);
+                               assert (!("<Node name=\"value\"><Node2/></Node>" in str));
                        } catch (GLib.Error e) {
                    GLib.message ("Error: "+e.message);
                    assert_not_reached ();