diff --git a/test/dbus-manager.sh b/test/dbus-manager.sh
index 80de5368..d06d95e8 100755
--- a/test/dbus-manager.sh
+++ b/test/dbus-manager.sh
@@ -137,3 +137,49 @@ case "$rl" in
     *)
         fail "Unexpected initctl runlevel output: $rl" ;;
 esac
+
+# ---------- legacy-parity edge semantics ----------
+
+say "Manager1.SetRunlevel with bogus level returns InvalidArgs"
+set +e
+texec "$CLIENT" call-u "$BUS" /org/finit/manager \
+    org.finit.Manager1 SetRunlevel 42 >/tmp/dbus-rl.out 2>&1
+rl_rc=$?
+set -e
+assert "Bogus runlevel rejected (rc=$rl_rc)" "$rl_rc" -eq 1
+case "$(cat /tmp/dbus-rl.out)" in
+    *InvalidArgs*) assert "Error is InvalidArgs" 0 -eq 0 ;;
+    *) fail "Unexpected reply: $(cat /tmp/dbus-rl.out)" ;;
+esac
+
+say "Manager1.Signal on a stopped service returns Failed"
+cat >> "$SYSROOT$FINIT_CONF" <<CONF
+service stopped-serv {
+    manual  = true
+    command = "serv -np"
+}
+CONF
+run "initctl reload"
+set +e
+texec "$CLIENT" call-su "$BUS" /org/finit/manager \
+    org.finit.Manager1 Signal stopped-serv 1 >/tmp/dbus-sig.out 2>&1
+sig_rc=$?
+set -e
+assert "Signal to stopped service rejected (rc=$sig_rc)" "$sig_rc" -eq 1
+case "$(cat /tmp/dbus-sig.out)" in
+    *Failed*) assert "Error is Failed" 0 -eq 0 ;;
+    *) fail "Unexpected reply: $(cat /tmp/dbus-sig.out)" ;;
+esac
+
+# Reboot cannot be invoked without shutting down the sandbox, so
+# verify the timeout argument via introspection instead.
+say "Reboot family declares the timeout argument in introspection"
+flat=$(printf '%s' "$xml" | tr -d '\n')
+for m in Reboot Poweroff Halt; do
+    case "$flat" in
+        *"<method name=\"$m\">      <arg type=\"u\" direction=\"in\"/>"*)
+            assert "$m takes (u)" 0 -eq 0 ;;
+        *)
+            fail "$m does not declare the timeout argument" ;;
+    esac
+done
diff --git a/test/src/dbus-auth-client.c b/test/src/dbus-auth-client.c
index c5908c34..2e7e6a2b 100644
--- a/test/src/dbus-auth-client.c
+++ b/test/src/dbus-auth-client.c
@@ -322,6 +322,40 @@ static int mode_call_s(int argc, char *argv[])
 	return do_call(argv[2], argv[3], argv[4], argv[5], argv[6]);
 }
 
+/* "u" and "su" variants for methods taking a uint32 argument */
+static int do_call_u(const char *sock, const char *obj, const char *iface,
+		     const char *method, const char *arg, uint32_t val)
+{
+	link_client_t *c;
+	int rc;
+
+	c = link_client_open(sock);
+	if (!c) return 2;
+
+	rc = arg
+		? link_client_call_v(c, obj, iface, method, "su", arg, val)
+		: link_client_call_v(c, obj, iface, method, "u", val);
+	rc = report_rc(c, rc);
+	if (rc == 0)
+		printf("OK\n");
+	link_client_close(c);
+	return rc;
+}
+
+static int mode_call_u(int argc, char *argv[])
+{
+	if (argc != 7) return 2;
+	return do_call_u(argv[2], argv[3], argv[4], argv[5], NULL,
+			 (uint32_t)strtoul(argv[6], NULL, 0));
+}
+
+static int mode_call_su(int argc, char *argv[])
+{
+	if (argc != 8) return 2;
+	return do_call_u(argv[2], argv[3], argv[4], argv[5], argv[6],
+			 (uint32_t)strtoul(argv[7], NULL, 0));
+}
+
 static int mode_call_void(int argc, char *argv[])
 {
 	if (argc != 6) return 2;
@@ -513,6 +547,8 @@ int main(int argc, char *argv[])
 	if (!strcmp(argv[1], "introspect"))       return mode_introspect      (argc, argv);
 	if (!strcmp(argv[1], "liststrings"))      return mode_liststrings     (argc, argv);
 	if (!strcmp(argv[1], "call-s"))           return mode_call_s          (argc, argv);
+	if (!strcmp(argv[1], "call-u"))           return mode_call_u          (argc, argv);
+	if (!strcmp(argv[1], "call-su"))          return mode_call_su         (argc, argv);
 	if (!strcmp(argv[1], "call-void"))        return mode_call_void       (argc, argv);
 	if (!strcmp(argv[1], "call-s-as-uid"))    return mode_call_s_as_uid   (argc, argv);
 	if (!strcmp(argv[1], "call-void-as-uid")) return mode_call_void_as_uid(argc, argv);