return (Collector) TO_OPTIONAL;
  }

  private static final Object NULL_PLACEHOLDER = new Object();

  private static final Collector<@Nullable Object, ?, @Nullable Object> ONLY_ELEMENT =
      Collector.<@Nullable Object, ToOptionalState, @Nullable Object>of(
          ToOptionalState::new,
          (state, o) -> state.add((o == null) ? NULL_PLACEHOLDER : o),
          ToOptionalState::combine,

                throw new CIFSException("Failed to decrypt MIC", e);
            }
        }

        final int expectSeq = this.verifySequence.getAndIncrement();
        if (expectSeq != seq) {
            throw new CIFSException(String.format("Invalid MIC sequence, expect %d have %d", expectSeq, seq));
        }

        final byte[] verify = new byte[8];
        System.arraycopy(mic, 4, verify, 0, 8);

     */
    @Test
    void testConcurrentWatch() throws Exception {
        // Create a thread-safe implementation
        SmbWatchHandle concurrentHandle = new SmbWatchHandle() {
            private final Object lock = new Object();
            private int watchCount = 0;

            @Override
            public List<FileNotifyInformation> watch() throws CIFSException {
                synchronized (lock) {

  private static final Function<Integer, Long> TO_LONG =
      new Function<Integer, Long>() {
        @Override
        public Long apply(Integer n) {
          return Long.valueOf(n);
        }
      };

  /* Helper function to make a BigInteger value from a Long. */
  private static final Function<Long, BigInteger> TO_BIGINTEGER =
      new Function<Long, BigInteger>() {
        @Override

    MockWebServer server = new MockWebServer();
    server.useHttps(sslContext.getSocketFactory(), false);
    server.setDispatcher(this);
    server.start(port);
  }

  @Override public MockResponse dispatch(RecordedRequest request) {
    String path = request.getPath();
    try {
      if (!path.startsWith("/") || path.contains("..")) throw new FileNotFoundException();

        Thread[] threads = new Thread[THREAD_COUNT];
        final boolean[] success = new boolean[THREAD_COUNT];

        for (int i = 0; i < THREAD_COUNT; i++) {
            final int index = i;
            threads[i] = new Thread(() -> {
                try {
                    // Each thread performs operations on the response
                    byte[] buffer = new byte[100];

        // Test String array
        final String[] arr = new String[] { "a", "b", "c" };
        binary = SerializeUtil.fromObjectToBinary(arr);
        final String[] result = (String[]) SerializeUtil.fromBinaryToObject(binary);
        assertEquals(arr.length, result.length);
        assertEquals(arr[0], result[0]);

        // Test ArrayList
        final List<String> list = new ArrayList<>();
        list.add("item1");

        int access = 0x01;
        IOException expectedException = new IOException("Network error");
        // Simulate IOException during RPC call
        doThrow(expectedException).when(mockDcerpcHandle).sendrecv(any(MsrpcSamrOpenDomain.class));

        // Act & Assert
        IOException thrown = assertThrows(IOException.class, () -> {
            new SamrDomainHandle(mockDcerpcHandle, mockPolicyHandle, access, mockSid);
        });

    void testWriteSetupWireFormat() {
        byte[] dst = new byte[10];
        int result = netServerEnum2.writeSetupWireFormat(dst, 0);
        assertEquals(0, result);
    }

    /**
     * Test the writeParametersWireFormat method for NET_SERVER_ENUM2.
     */
    @Test
    void testWriteParametersWireFormat_Enum2() throws UnsupportedEncodingException {
        byte[] dst = new byte[100];

        final DuplicateHostPager pager = copyBeanToNewBean(body, DuplicateHostPager.class);
        final List<DuplicateHost> list = duplicateHostService.getDuplicateHostList(pager);
        return asJson(
                new ApiResult.ApiConfigsResponse<EditBody>().settings(list.stream().map(this::createEditBody).collect(Collectors.toList()))
                        .total(pager.getAllRecordCount())
                        .status(ApiResult.Status.OK)