// Then - Buffer should have expected size
        assertNotNull(buffer, "Buffer should not be null");
        assertEquals(SmbComTransaction.TRANSACTION_BUF_SIZE, buffer.length, "Buffer should have TRANSACTION_BUF_SIZE");

        // The validation in getBuffer() ensures size is within bounds (0 < size <= 1MB)
        assertTrue(buffer.length > 0, "Buffer size should be positive");

    }

    @Test
    @DisplayName("Test nextElement method")
    void testNextElement() {
        transaction.setMaxBufferSize(4096);
        transaction.setBuffer(new byte[SmbComTransaction.TRANSACTION_BUF_SIZE]);
        transaction.setParametersWireFormatReturn(100);
        transaction.setDataWireFormatReturn(200);

        SmbComTransaction result = transaction.nextElement();

abstract class SmbComTransaction extends ServerMessageBlock implements Enumeration {

    private static final int DEFAULT_MAX_DATA_COUNT =
            Config.getInt("jcifs.smb1.smb.client.transaction_buf_size", SmbComTransaction.TRANSACTION_BUF_SIZE) - 512;

    // relative to headerStart
    private static final int PRIMARY_SETUP_OFFSET = 61;
    private static final int SECONDARY_PARAMETER_OFFSET = 51;

        if (buf != null) {
            queueSize.decrementAndGet();
            return buf;
        }

        // Validate buffer size to prevent overflow
        int bufferSize = SmbComTransaction.TRANSACTION_BUF_SIZE;
        if (bufferSize < 0 || bufferSize > MAX_BUFFER_SIZE) {
            throw new IllegalStateException("Invalid buffer size: " + bufferSize);
        }

        return new byte[bufferSize];
    }

    }

    @Test
    @DisplayName("Test default buffer size constant")
    void testBufferSizeConstant() {
        assertEquals(0xFFFF, SmbComTransaction.TRANSACTION_BUF_SIZE, "TRANSACTION_BUF_SIZE should be 0xFFFF");
    }

    @Test
    @DisplayName("Test transaction subcommand constants")
    void testSubcommandConstants() {
        // Test Trans2 subcommands

    private int pad2 = 0;
    private boolean hasMore = true;
    private boolean isPrimary = true;
    private int bufParameterOffset;
    private int bufDataOffset;

    static final int TRANSACTION_BUF_SIZE = 0xFFFF;

    /**
     * SMB TRANS2 subcommand for finding first matching files
     */
    public static final byte TRANS2_FIND_FIRST2 = (byte) 0x01;
    /**

     *
     * @return the maximum size of IO buffers, limits the maximum message size
     */
    int getMaximumBufferSize();

    /**
     *
     * Property {@code jcifs.smb.client.transaction_buf_size} (int, default 65535)
     *
     * @return maximum data size for SMB transactions
     */
    int getTransactionBufferSize();

    /**
     *