cpw_test_fail
cpw_test_fail(user, princ, pass, 0);
cpw_test_fail("admin", hist_princ, "pw", KADM5_PROTECT_PRINCIPAL);
cpw_test_fail("admin/none", princ, "pw3", KADM5_AUTH_CHANGEPW);
cpw_test_fail("$admin", princ, "pw3", KADM5_AUTH_CHANGEPW);
cpw_test_fail(NULL, princ, "pw", KADM5_BAD_SERVER_HANDLE);
cpw_test_fail("admin", NULL, "pw", EINVAL);