[glib] Improve GType test coverage

[Matthias Clasen <matthiasc src gnome org>]

commit 4c3b009992f585ce00cafc8cd38941eb646df8e5
Author: Matthias Clasen <mclasen redhat com>
Date:   Thu Nov 28 21:58:48 2013 -0500

    Improve GType test coverage
    
    Add a test for g_type_class_get_instance_private_offset

 gobject/tests/private.c |    8 ++++++++
 1 files changed, 8 insertions(+), 0 deletions(-)
---
diff --git a/gobject/tests/private.c b/gobject/tests/private.c
index 80ef9fc..a960e50 100644
--- a/gobject/tests/private.c
+++ b/gobject/tests/private.c
@@ -201,10 +201,18 @@ static void
 private_instance (void)
 {
   TestObject *obj = g_object_new (test_object_get_type (), NULL);
+  gpointer class;
+  gint offset;
 
   g_assert_cmpint (test_object_get_dummy_0 (obj), ==, 42);
   g_assert_cmpfloat (test_object_get_dummy_1 (obj), ==, 3.14159f);
 
+  class = g_type_class_ref (test_object_get_type ());
+  offset = g_type_class_get_instance_private_offset (class);
+  g_type_class_unref (class);
+
+  g_assert (offset == TestObject_private_offset);
+
   g_object_unref (obj);
 }