case 4:
                state = 0;
                throw new TransportException("Connection in error", te);
            default:
                final TransportException te = new TransportException("Invalid state: " + state);
                state = 0;
                throw te;
            }

            state = 1;
            te = null;
            thread = new Thread(this, name);

            TransportException exception = new TransportException("Message", rootCause);

            assertEquals(rootCause, exception.getRootCause());
        }

        @Test
        @DisplayName("Should return null when no root cause")
        void testGetRootCauseWhenNull() {
            TransportException exception = new TransportException("Message");

            case 4:
                this.state = 6;
                throw new TransportException("Connection in error", this.te);
            case 5:
            case 6:
                log.debug("Trying to connect a disconnected transport");
                return false;
            default:
                final TransportException tex = new TransportException("Invalid state: " + st);
                throw tex;
            }

import jcifs.internal.smb1.com.SmbComClose;
import jcifs.internal.smb1.com.SmbComFindClose2;
import jcifs.internal.smb1.trans.nt.NtTransQuerySecurityDesc;
import jcifs.util.transport.TransportException;

/**
 * This class encapsulates the logic for switching tree connections
 *
 * Switching trees can occur either when the tree has been disconnected by failure or idle-timeout - as well as on
 * DFS referrals.

import jcifs.smb1.util.LogStream;
import jcifs.smb1.util.transport.Request;
import jcifs.smb1.util.transport.Response;
import jcifs.smb1.util.transport.Transport;
import jcifs.smb1.util.transport.TransportException;

/**
 * Legacy SMB transport implementation for SMB1 protocol communication.
 * Handles the low-level transport layer for SMB1 protocol messages.
 */

import jcifs.Address;
import jcifs.CIFSContext;
import jcifs.CIFSException;
import jcifs.SmbConstants;
import jcifs.SmbTransport;
import jcifs.SmbTransportPool;
import jcifs.util.transport.TransportException;

/**
 * Implementation of the SMB transport pool for managing SMB connections.
 * Provides connection pooling and reuse for improved performance.
 *
 * @author mbechler
 *

     */
    protected static IOException seToIoe(final SmbException se) {
        IOException ioe = se;
        Throwable root = se.getCause();
        if (root instanceof TransportException) {
            ioe = (TransportException) root;
            root = ioe.getCause();
        }
        if (root instanceof InterruptedException) {
            ioe = new InterruptedIOException(root.getMessage());

        @Test
        @DisplayName("seToIoe maps Interrupted cause to InterruptedIOException")
        void seToIoeInterruptedMapping() {
            SmbException se = new SmbException("x", new jcifs.util.transport.TransportException(new InterruptedException("boom")));
            IOException ioe = SmbFileInputStream.seToIoe(se);
            assertTrue(ioe instanceof InterruptedIOException);
            assertTrue(ioe.getMessage().contains("boom"));

        // Configure the tree to throw transport error on first call, succeed on second
        when(tree.send(eq(req), eq(resp), anySet()))
                .thenThrow(new SmbException("transport error", new jcifs.util.transport.TransportException()))
                .thenReturn(resp);

        setTree(c, tree);

        // Override connectHost to avoid actual network connection on retry
        doAnswer(invocation -> {