tests: Add a test for g_assert_finalize_object()

A simple test just to double-check it works. See #488.

Signed-off-by: Philip Withnall <withnall@endlessm.com>

Helps: #488

gobject/tests/meson.build

@@ -50,6 +50,7 @@ gobject_tests = {
   'signals' : {
     'source' : ['signals.c', marshalers_h, marshalers_c],
   },
+  'testing' : {},
 }
 
 if cc.get_id() != 'msvc'

gobject/tests/testing.c

@@ -0,0 +1,71 @@
+/* GLib testing framework examples and tests
+ *
+ * Copyright © 2019 Endless Mobile, Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library 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.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General
+ * Public License along with this library; if not, see <http://www.gnu.org/licenses/>.
+ *
+ * Author: Philip Withnall <withnall@endlessm.com>
+ */
+
+#include "config.h"
+
+/* We want to distinguish between messages originating from libglib
+ * and messages originating from this program.
+ */
+#undef G_LOG_DOMAIN
+#define G_LOG_DOMAIN "testing"
+
+#include <glib.h>
+#include <glib-object.h>
+#include <locale.h>
+#include <stdlib.h>
+
+static void
+test_assert_finalize_object_subprocess_bad (void)
+{
+  GObject *obj = g_object_new (G_TYPE_OBJECT, NULL);
+  g_object_ref (obj);
+
+  /* This should emit an assertion failure. */
+  g_assert_finalize_object (obj);
+
+  g_object_unref (obj);
+
+  exit (0);
+}
+
+static void
+test_assert_finalize_object (void)
+{
+  GObject *obj = g_object_new (G_TYPE_OBJECT, NULL);
+
+  g_assert_finalize_object (obj);
+
+  g_test_trap_subprocess ("/assert/finalize_object/subprocess/bad", 0, 0);
+  g_test_trap_assert_failed ();
+  g_test_trap_assert_stderr ("*g_assert_finalize_object:*'weak_pointer' should be NULL*");
+}
+
+int
+main (int   argc,
+      char *argv[])
+{
+  g_test_init (&argc, &argv, NULL);
+
+  g_test_add_func ("/assert/finalize_object", test_assert_finalize_object);
+  g_test_add_func ("/assert/finalize_object/subprocess/bad",
+                   test_assert_finalize_object_subprocess_bad);
+
+  return g_test_run ();
+}