assertEquals(state, result, "isOpen should reflect handle state");
        verify(handle, times(1)).isOpen();
    }

    @Test
    @DisplayName("ensureTreeConnected delegates and returns the tree handle")
    void ensureTreeConnected_delegatesAndReturns() throws Exception {
        // Arrange
        SmbPipeOutputStream out = newStream();
        when(handle.ensureTreeConnected()).thenReturn(tree);

        // Act

    }

    @Test
    @DisplayName("Should handle null delimiter by inserting 'null' string")
    void testJoinWithNullDelimiter() {
        String result = StringUtil.join(null, "first", "second", "third");
        assertEquals("firstnullsecondnullthird", result);
    }

    @Test
    @DisplayName("Should handle null elements in array")
    void testJoinWithNullElements() {

import jcifs.smb1.dcerpc.rpc;
import jcifs.smb1.smb1.SmbException;

/**
 * LSA policy handle for Local Security Authority operations.
 */
public class LsaPolicyHandle extends rpc.policy_handle {

    DcerpcHandle handle;

    /**
     * Constructs an LSA policy handle.
     *
     * @param handle the DCERPC handle
     * @param server the server name
     * @param access the access rights

        assertNotNull(capturedRpc);
        assertEquals(mockPolicyHandle, capturedRpc.handle);
        assertEquals(access, capturedRpc.access_mask);
        assertEquals(mockSid, capturedRpc.sid);
        assertEquals(handle, capturedRpc.domain_handle); // Ensure the handle itself is passed for output
    }

    @Test
    void constructor_shouldThrowSmbExceptionOnRpcError() throws IOException {

import jcifs.smb1.smb1.SmbException;

/**
 * Handle for Security Account Manager (SAM) alias operations.
 * This class represents an open handle to a SAM alias and provides
 * operations for managing alias membership and properties.
 */
public class SamrAliasHandle extends rpc.policy_handle {

    DcerpcHandle handle;

    /**
     * Creates a new SAM alias handle.
     *
     * @param handle the DCE/RPC handle for communication

public class SmbPipeOutputStream extends SmbFileOutputStream {

    private final SmbPipeHandleImpl handle;

    /**
     * @param handle
     * @throws SmbException
     */
    SmbPipeOutputStream(final SmbPipeHandleImpl handle, final SmbTreeHandleImpl th) throws CIFSException {
        super(handle.getPipe(), th, null, 0, 0, 0);
        this.handle = handle;
    }

    /**
     * {@inheritDoc}
     *

/**
 * MSRPC implementation for opening an alias handle.
 * This class provides functionality to open a handle to a SAM alias
 * (local group) using the SAMR RPC interface.
 */
public class MsrpcSamrOpenAlias extends samr.SamrOpenAlias {

    /**
     * Creates a new request to open an alias handle.
     *
     * @param handle the domain handle
     * @param access the desired access rights

    private final SmbFileHandleImpl handle;
    private final int filter;
    private final boolean recursive;

    /**
     * @param fh
     * @param filter
     * @param recursive
     *
     */
    public SmbWatchHandleImpl(final SmbFileHandleImpl fh, final int filter, final boolean recursive) {
        this.handle = fh;
        this.filter = filter;
        this.recursive = recursive;

     *
     * @param handle the DCE/RPC handle for communication
     * @param server the server name (null defaults to local server)
     * @param access the desired access rights
     * @throws IOException if an I/O error occurs during handle creation
     */
    public SamrPolicyHandle(final DcerpcHandle handle, String server, final int access) throws IOException {
        this.handle = handle;
        if (server == null) {

    }

    /**
     * Sets the context handle for unregistration.
     *
     * @param contextHandle the context handle from registration
     */
    public void setContextHandle(byte[] contextHandle) {
        this.contextHandle = contextHandle != null ? contextHandle.clone() : null;
    }

    /**
     * Gets the context handle.
     *
     * @return the context handle
     */
    public byte[] getContextHandle() {