+#include <ccan/tap/tap.h>
+#include <stdlib.h>
+#include <ccan/opt/opt.c>
+#include <ccan/opt/usage.c>
+#include <ccan/opt/helpers.c>
+#include <ccan/opt/parse.c>
+#include "utils.h"
+
+int main(int argc, char *argv[])
+{
+ const char *myname = argv[0];
+
+ plan_tests(14);
+
+ /* Simple short arg.*/
+ opt_register_noarg("--aaa|-a", test_noarg, NULL, "AAAAAAll");
+ opt_register_noarg("-b", test_noarg, NULL, "AAAAAAll");
+
+ /* We can't unregister wrong ones, but can unregister correct one */
+ ok1(!opt_unregister("--aaa"));
+ ok1(!opt_unregister("-a"));
+ ok1(opt_unregister("--aaa|-a"));
+
+ /* Arg parsing works as if we'd never registered it */
+ ok1(parse_args(&argc, &argv, "-b", NULL));
+ ok1(argc == 1);
+ ok1(argv[0] == myname);
+ ok1(argv[1] == NULL);
+ ok1(test_cb_called == 1);
+
+ ok1(!parse_args(&argc, &argv, "--aaa", NULL));
+
+ /* We can still add another one OK. */
+ opt_register_noarg("-c", test_noarg, NULL, "AAAAAAll");
+ ok1(parse_args(&argc, &argv, "-c", NULL));
+ ok1(argc == 1);
+ ok1(argv[0] == myname);
+ ok1(argv[1] == NULL);
+ ok1(test_cb_called == 2);
+
+ /* parse_args allocates argv */
+ free(argv);
+ return exit_status();
+}