tests: Add many autoptr tests

I love Emacs keyboard macros, used them to convert the list of
defines cleverly into a list of tests, then iterated and filled in
the necessary constructor arguments.

gio/tests/Makefile.am

@@ -489,6 +489,12 @@ gdbus_serialization_SOURCES = \
 	gdbus-tests.c
 endif
 
+if HAVE_GCC
+test_programs += \
+	autoptr				\
+	$(NULL)
+endif
+
 # -----------------------------------------------------------------------------
 #  The resources test is a bit more complicated...
 

gio/tests/autoptr.c

@@ -0,0 +1,23 @@
+#include <gio/gio.h>
+
+static void
+test_autoptr (void)
+{
+  g_autoptr(GFile) p = g_file_new_for_path ("/blah");
+  g_autoptr(GInetAddress) a = g_inet_address_new_from_string ("127.0.0.1");
+  g_autofree gchar *path = g_file_get_path (p);
+  g_autofree gchar *istr = g_inet_address_to_string (a);
+
+  g_assert_cmpstr (path, ==, "/blah");
+  g_assert_cmpstr (istr, ==, "127.0.0.1");
+}
+
+int
+main (int argc, char *argv[])
+{
+  g_test_init (&argc, &argv, NULL);
+
+  g_test_add_func ("/autoptr/autoptr", test_autoptr);
+
+  return g_test_run ();
+}