```java
public class WitnessStatistics {
    private final AtomicLong registrationsActive = new AtomicLong();
    private final AtomicLong notificationsReceived = new AtomicLong();
    private final AtomicLong failoverEvents = new AtomicLong();
    private final AtomicLong heartbeatsSent = new AtomicLong();
    private final AtomicLong registrationFailures = new AtomicLong();
    

        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        writeLittleEndianInt(baos, PacSignature.KERB_CHECKSUM_HMAC_MD5);
        // Write only 10 bytes instead of 16
        baos.write(new byte[10]);
        byte[] data = baos.toByteArray();

        // Verify that PACDecodingException is thrown
        assertThrows(PACDecodingException.class, () -> {
            new PacSignature(data);
        });
    }

        assertArrayEquals(new byte[] { 0x05, 0x06, 0x07, 0x08 }, responseBuffer);
    }

    @Test
    @DisplayName("Test with empty buffers")
    void testWithEmptyBuffers() {
        // Test with empty byte arrays
        byte[] emptyRequestBuffer = new byte[0];
        byte[] emptyResponseBuffer = new byte[0];

        final BufferedInputStream bis = new BufferedInputStream(in);
        bis.mark(preloadSize);

        String preloadDate = StringUtil.EMPTY;
        final byte[] bytes = new byte[preloadSize];
        try {
            if (bis.read(bytes) == -1) {
                throw new CrawlingAccessException("No sitemaps data.");
            }

            preloadDate = new String(bytes, Constants.UTF_8);

        doThrow(new CIFSException("Context cannot be null")).when(sidResolver).resolveSids(eq(null), anyString(), any(SID[].class));

        assertThrows(CIFSException.class, () -> sidResolver.resolveSids(null, testServerName, testSids));
    }

    @Test
    void testResolveSids_WithNullServerName() throws CIFSException {
        doThrow(new CIFSException("Server name cannot be null")).when(sidResolver)

        // SMB1 negotiation with server data
        SmbComNegotiateResponse smb1 = new SmbComNegotiateResponse(ctx);
        ServerData sd = smb1.getServerData();
        sd.encryptionKey = new byte[] { 1, 2, 3 };
        setField(transport, "negotiated", smb1);
        assertArrayEquals(new byte[] { 1, 2, 3 }, transport.getServerEncryptionKey());

        // SMB2 negotiation never exposes key via this API

        final Name calledName = new Name(tc.getConfig(), this.address.firstCalledName(), 0x20, null);
        do {
            this.socket = new Socket();
            if (this.localAddr != null) {
                this.socket.bind(new InetSocketAddress(this.localAddr, this.localPort));
            }

        void testConcurrentReceived() throws InterruptedException {
            int threadCount = 10;
            CountDownLatch startLatch = new CountDownLatch(1);
            CountDownLatch endLatch = new CountDownLatch(threadCount);

            for (int i = 0; i < threadCount; i++) {
                new Thread(() -> {
                    try {
                        startLatch.await();
                        response.received();

        response = new Smb2QueryDirectoryResponse(mockConfig, expectInfoClass);

        assertNotNull(response);
        assertNull(response.getResults()); // Should be null before decoding
    }

    @Test
    @DisplayName("Test getResults returns null initially")
    void testGetResultsInitiallyNull() {
        response = new Smb2QueryDirectoryResponse(mockConfig, (byte) 0x03);

    @BeforeEach
    public void setUp() {
        testGuid = new HandleGuid();
        testFileId = new byte[16];
        for (int i = 0; i < 16; i++) {
            testFileId[i] = (byte) (i + 1);
        }
        testLeaseKey = new Smb2LeaseKey();
    }

    @Test
    public void testHandleInfoCreation() {