Improve GIOModule test coverage

Add a dedicated test for GIOModule.

gio/tests/modules/test-module-b.c

@@ -0,0 +1,57 @@
+/* Test module for GIOModule tests
+ * Copyright (C) 2013 Red Hat, Inc
+ * Author: Matthias Clasen
+ *
+ * This work is provided "as is"; redistribution and modification
+ * in whole or in part, in any medium, physical or electronic is
+ * permitted without restriction.
+ *
+ * This work 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.
+ *
+ * In no event shall the authors or contributors be liable for any
+ * direct, indirect, incidental, special, exemplary, or consequential
+ * damages (including, but not limited to, procurement of substitute
+ * goods or services; loss of use, data, or profits; or business
+ * interruption) however caused and on any theory of liability, whether
+ * in contract, strict liability, or tort (including negligence or
+ * otherwise) arising in any way out of the use of this software, even
+ * if advised of the possibility of such damage.
+ */
+
+#include <gio/gio.h>
+
+typedef struct _TestB {
+  GObject parent;
+} TestB;
+
+typedef struct _TestBClass {
+  GObjectClass parent_class;
+} TestBClass;
+
+G_DEFINE_TYPE (TestB, test_b, G_TYPE_OBJECT)
+
+static void
+test_b_class_init (TestBClass *class)
+{
+}
+
+static void
+test_b_init (TestB *self)
+{
+}
+
+void
+g_io_module_load (GIOModule *module)
+{
+  g_io_extension_point_implement ("test-extension-point",
+                                  test_b_get_type (),
+                                  "test-b",
+                                  40);
+}
+
+void
+g_io_module_unload (GIOModule *module)
+{
+}