@Nested
    @DisplayName("Resource management tests")
    class ResourceManagementTests {

        @Test
        @DisplayName("acquire should increment usage count")
        void shouldIncrementUsageCount() {
            long initial = transport.getUsageCount();
            transport.acquire();
            assertEquals(initial + 1, transport.getUsageCount());
        }

        @Test

    void contextAccessor() {
        assertSame(ctx, transport.getContext());
    }

    @Test
    @DisplayName("acquire returns same instance")
    void acquireReturnsSameInstance() {
        SmbTransportImpl acquired = transport.acquire();
        assertSame(transport, acquired);
        transport.close(); // release once
    }

    @Test

     */
    protected synchronized SmbFileHandleImpl ensureOpen() throws CIFSException {
        if (!isOpen()) {
            // one extra acquire to keep this open till the stream is released
            this.handle = this.file.openUnshared(this.openFlags, this.access, this.sharing, SmbConstants.ATTR_NORMAL, 0).acquire();
            if (this.append) {
                this.fp = this.handle.getInitialSize();
                if (log.isDebugEnabled()) {

        if (this.handle == null || !this.handle.isValid()) {
            // one extra acquire to keep this open till the stream is released
            this.handle =
                    this.file.openUnshared(this.openFlags, this.access, this.sharing, SmbConstants.ATTR_NORMAL, this.options).acquire();
            return this.handle;
        }
        return this.handle.acquire();
    }

    /**
     * Ensures that the file descriptor is openend

        @Test
        @DisplayName("open() acquires handle and closes it")
        void openDelegatesEnsureOpenAndCloses() throws Exception {
            SmbFileInputStream in = newStream();
            in.open();
            // ensureOpen returns acquired handle; try-with-resources must close it
            verify(mockHandle, times(1)).close();
            verify(mockHandle, atLeastOnce()).acquire();
        }

        @Test

            } else {
                this.handle = this.file.openUnshared(this.openFlags, this.access, this.sharing, SmbConstants.ATTR_NORMAL, 0).acquire();
            }
            return this.handle;
        }
        return this.handle.acquire();
    }

    /**
     * Converts an SmbException to an IOException
     *
     * @param se the SmbException to convert

        throw new ClassCastException();
    }

    /**
     * @return session increased usage count
     */
    public SmbSessionImpl acquire() {
        long usage = this.usageCount.incrementAndGet();
        if (log.isTraceEnabled()) {
            log.trace("Acquire session " + usage + " " + this);
        }

        if (usage == 1) {
            synchronized (this) {

                    continue;
                }

                if (log.isTraceEnabled()) {
                    log.trace("Reusing transport connection " + conn);
                }
                return conn.acquire();
            }
        }

        return null;
    }

    @Override
    public SmbTransportImpl getSmbTransport(final CIFSContext tf, final String name, final int port, final boolean exclusive,

        } else {
            throw new SmbException("The requested list operations is invalid: " + locator.getURL());
        }
        this.response = new NetServerEnum2Response(th.getConfig());

        this.treeHandle = th.acquire();
        try {
            this.next = open();
        } catch (final Exception e) {
            this.treeHandle.release();
            throw e;
        }

    }

        return this.transportContext;
    }

    /**
     * {@inheritDoc}
     *
     * @see jcifs.util.transport.Transport#acquire()
     */
    @Override
    public SmbTransportImpl acquire() {
        return (SmbTransportImpl) super.acquire();
    }

    /**
     * @return the server's encryption key
     */
    @Override
    public byte[] getServerEncryptionKey() {