assertFalse(Arrays.equals(new byte[24], resp), "Response must not be all zeros");
    }

    @Test
    @DisplayName("getLMv2Response(byte[]): empty client data allowed")
    void testGetLMv2Response_bytes_emptyClientData() {
        // Arrange
        byte[] key = hex("000102030405060708090A0B0C0D0E0F");
        byte[] server = hex("0102030405060708");
        byte[] client = new byte[0];

        // Act