g_object_set (source, "foo", 10, NULL);
g_assert_cmpint (source->foo, ==, 10);
g_assert_cmpint (source->bar, ==, 10);
+ g_object_set (source, "bar", 30, NULL);
+ g_assert_cmpint (source->foo, ==, 30);
+ g_assert_cmpint (source->bar, ==, 30);
g_object_unref (source);
}