// Unknown code → hex string (uppercase)
                Arguments.of(0xDEADBEEF, "0xDEADBEEF"));
    }

    @ParameterizedTest
    @MethodSource("errorCodes")
    void constructorInitialisesMessageAndStatus(int code, String expectedMsg) {
        SmbAuthException e = new SmbAuthException(code);
        assertEquals(expectedMsg, e.getMessage(), "message for code " + Integer.toHexString(code));