// Assert: enumeration is empty and close produced no extra close call (no fileId opened)
        assertFalse(it.hasNext(), "Empty listing should produce no elements");
        it.close();
        // No close should be sent because directory was never successfully opened
        verify(tree, never()).send(argThat((Request<?> r) -> r instanceof Smb2CloseRequest));
    }

    @Test

import jcifs.internal.smb1.ServerMessageBlock;
import jcifs.internal.util.SMBUtil;

/**
 * SMB1 Write AndX request message.
 *
 * This command is used to write data to a file that has been
 * previously opened with an Open command.
 */
public class SmbComWriteAndX extends AndXServerMessageBlock {

    private int fid, remaining, dataLength, dataOffset, off;
    private byte[] b;
    private long offset;
    private int pad;

import jcifs.internal.smb2.rdma.RdmaChannelInfo;
import jcifs.internal.util.SMBUtil;

/**
 * SMB2 Write request message.
 *
 * This command is used to write data to a file that has been
 * previously opened with a Create request.
 *
 * @author mbechler
 */
public class Smb2WriteRequest extends ServerMessageBlock2Request<Smb2WriteResponse> implements RequestWithFileId {

    /**

        // Assert
        assertNotNull(handle);
        verify(mockDcerpcHandle, times(1)).sendrecv(any(MsrpcLsarOpenPolicy2.class));
        // We cannot directly assert the 'opened' field as it's private, but successful construction implies it.
    }

    @Test
    void constructor_shouldHandleNullServerSuccessfully() throws IOException {
        // Arrange
        String server = null;

import jcifs.internal.smb1.ServerMessageBlock;
import jcifs.internal.util.SMBUtil;

/**
 * SMB1 Read AndX request message.
 *
 * This command is used to read data from a file that has been
 * previously opened with an Open command.
 */
public class SmbComReadAndX extends AndXServerMessageBlock {

    private long offset;
    private int fid;
    int openTimeout;
    int maxCount, minCount, remaining;

    /**

        if (current == State.HALF_OPEN) {
            // Single failure in half-open state reopens the circuit
            if (state.compareAndSet(State.HALF_OPEN, State.OPEN)) {
                stateChangeTime.set(System.currentTimeMillis());
                consecutiveFailures.set(1);
                log.warn("Circuit breaker {} reopened due to failure in HALF_OPEN state", name);
            }

        verify(mockHandle, never()).sendrecv(any(MsrpcSamrConnect2.class));
    }

    @Test
    void testClose_Successful() throws IOException {
        // Test case: close() when opened and successful MsrpcSamrCloseHandle
        String server = "testServer";
        int access = 123;

        // Setup for successful constructor

            return 0;
        }
        final long start = fp;

        if (tmp == null) {
            throw new IOException("Bad file descriptor");
        }
        // ensure file is open
        file.open(openFlags, access, SmbFile.ATTR_NORMAL, 0);

        /*
         * Read AndX Request / Response
         */

        if (LogStream.level >= 4) {

            this.throwOnCloseInternal = true;
            return this;
        }

        @Override
        protected FileEntry open() throws CIFSException {
            if (staticThrowOnOpen)
                throw new CIFSException("open fail");
            // Simulate fetching first page during open
            if (staticPages != null && !staticPages.isEmpty()) {
                pageIdx = 0;
            }

     */
    public Handler() {
        // Default constructor
    }

    /**
     * Opens a connection to the GCS URL.
     *
     * @param u The URL to open a connection to
     * @return A new GcsURLConnection instance
     * @throws IOException If the connection cannot be opened
     */
    @Override
    protected URLConnection openConnection(final URL u) throws IOException {