[gxml] Added GomDocument.read_from_file()

[Daniel Espinosa Ortiz <despinosa src gnome org>]

commit bed78f0faac609628beaa2fc6ea0fa7118aab5e9
Author: Daniel Espinosa <esodan gmail com>
Date:   Mon Dec 12 17:43:46 2016 -0600

    Added GomDocument.read_from_file()
    
    This is required to provide equivalent functionality to
    Serializable, may a read_from_string() could be useful too

 gxml/GomDocument.vala     |    7 +++++++
 test/GomDocumentTest.vala |   22 ++++++++++++++++++++++
 test/TElementTest.vala    |    2 +-
 3 files changed, 30 insertions(+), 1 deletions(-)
---
diff --git a/gxml/GomDocument.vala b/gxml/GomDocument.vala
index 979a188..e0b242e 100644
--- a/gxml/GomDocument.vala
+++ b/gxml/GomDocument.vala
@@ -102,6 +102,13 @@ public class GXml.GomDocument : GomNode,
     var parser = new XParser (this);
     parser.write_stream (stream, null);
   }
+  /**
+   * Read file contents and parse it to document.
+   */
+  public void read_from_file (GLib.File file) throws GLib.Error {
+    var parser = new XParser (this);
+    parser.read_file (file, null);
+  }
 
   public DomElement create_element (string local_name) throws GLib.Error {
     return new GomElement.initialize (this, local_name);
diff --git a/test/GomDocumentTest.vala b/test/GomDocumentTest.vala
index 6ed027d..100091b 100644
--- a/test/GomDocumentTest.vala
+++ b/test/GomDocumentTest.vala
@@ -93,6 +93,28 @@ class GomDocumentTest : GXmlTest {
                                assert_not_reached ();
                        }
                        });
+               Test.add_func ("/gxml/gom-document/read-gfile/local", () => {
+                       try {
+                               var f = GLib.File.new_for_path 
(GXmlTestConfig.TEST_SAVE_DIR+"/tw-test-file.xml");
+                               if (f.query_exists ()) f.delete ();
+                               var s = new GLib.StringBuilder ();
+                               s.append ("""<document_element />""");
+                               var d = new GomDocument.from_string (s.str);
+                               var parser = new XParser (d);
+                               Test.message ("Saving to file: "+f.get_uri ()+parser.write_string ());
+                               d.write_file (f);
+                               assert (f.query_exists ());
+                               var d2 = new GomDocument ();
+                               assert (d2 != null);
+                               d2.read_from_file (f);
+                               assert (d2.document_element != null);
+                               assert (d2.document_element.node_name == "document_element");
+                               f.delete ();
+                       } catch (GLib.Error e) {
+                               GLib.message ("Error: "+e.message);
+                               assert_not_reached ();
+                       }
+                       });
                Test.add_func ("/gxml/gom-document/gfile/remote/read", () => {
                        try {
                                var rf = GLib.File.new_for_uri 
("https://git.gnome.org/browse/gxml/plain/gxml.doap";);
diff --git a/test/TElementTest.vala b/test/TElementTest.vala
index ef5d790..26dac2f 100644
--- a/test/TElementTest.vala
+++ b/test/TElementTest.vala
@@ -54,9 +54,9 @@ class TElementTest : GXmlTest {
                        assert (c.content == "");
                        c.content = "";
                        assert (c.content == "");
-                       assert (c.children_nodes.size == 1);
                        c.content = "HELLO CONTENT";
                        assert (c.children_nodes.size == 1);
+                       assert (c.children_nodes.size == 1);
                        assert (c.content == "HELLO CONTENT");
                        } catch { assert_not_reached (); }
                });