@Mock
    private NameServiceClient nameServiceClient;

    @BeforeEach
    void setUp() {
        MockitoAnnotations.openMocks(this);
    }

    @Test
    void testGetLocalHost() {
        // Arrange
        NetbiosAddress expectedAddress = mock(NetbiosAddress.class);
        when(nameServiceClient.getLocalHost()).thenReturn(expectedAddress);

        // Act

        DcerpcHandle handle = mock(DcerpcHandle.class);
        LsaPolicyHandle policy = mock(LsaPolicyHandle.class);

        jcifs.SID[] sids = new jcifs.SID[] { sid("S-1-1-0") };

        // Arrange a minimal response with given retval
        doAnswer(inv -> {
            jcifs.dcerpc.msrpc.MsrpcLookupSids rpc = inv.getArgument(0);
            rpc.retval = ret;
            // Provide empty arrays to satisfy code paths

    @BeforeEach
    void setUp() {
        // Setup is minimal - mocks are configured per test as needed
    }

    @Test
    void constructor_shouldInitializeWithValidParameters() {
        // Arrange
        jcifs.SID mockSid1 = mock(jcifs.SID.class);
        jcifs.SID mockSid2 = mock(jcifs.SID.class);
        when(mockSid1.unwrap(sid_t.class)).thenReturn(mockSidT);

        assertEquals("\\PIPE\\", trans.name);
    }

    @Test
    @DisplayName("Test writeSetupWireFormat writes correct data")
    void testWriteSetupWireFormat() {
        // Arrange
        TransTransactNamedPipe trans = new TransTransactNamedPipe(mockConfig, TEST_FID, TEST_DATA, TEST_OFFSET, TEST_LENGTH);
        byte[] dst = new byte[10];
        int dstIndex = 0;

        // Act

        // FID is written in writeSetupWireFormat, verify it there
    }

    @Test
    @DisplayName("writeSetupWireFormat should write correct bytes")
    void testWriteSetupWireFormat() {
        // Arrange
        transPeekNamedPipe = new TransPeekNamedPipe(mockConfig, TEST_PIPE_NAME, TEST_FID);
        byte[] buffer = new byte[10];
        int offset = 2;

        // Act

        // Arrange
        byte[] dst = new byte[100];
        int dstIndex = 0;

        // Act
        int result = response.writeParametersWireFormat(dst, dstIndex);

        // Assert
        assertEquals(0, result);
    }

    @Test
    @DisplayName("writeParametersWireFormat with offset should return 0")
    void testWriteParametersWireFormatWithOffset() {
        // Arrange

    @Mock
    SmbTreeHandleImpl tree;

    @Mock
    SmbNamedPipe pipe;

    @Mock
    SmbFileHandleImpl fileHandle;

    private SmbPipeOutputStream newStream() throws CIFSException {
        // Arrange common constructor collaborators to avoid touching network/state
        when(handle.getPipe()).thenReturn(pipe);
        when(tree.isSMB2()).thenReturn(true);
        when(tree.getSendBufferSize()).thenReturn(4096);

    }

    @Test
    @DisplayName("Default ctor: null message/cause; toString is class name; type hierarchy")
    void defaultConstructor_hasNullMessageAndCause_andTypeHierarchy() {
        // Arrange & Act
        SMBProtocolDowngradeException ex = new SMBProtocolDowngradeException();

        // Assert - message and cause are null
        assertNull(ex.getMessage(), "Default constructor should have null message");

        @DisplayName("Accepts IPC$ URLs (happy path)")
        @ValueSource(strings = { "smb://server/IPC$/foo", "smb://server/IPC$/PIPE/foo" })
        void constructsWithIpcShare(String url) throws Exception {
            // Arrange & Act
            SmbNamedPipe pipe = new SmbNamedPipe(url, SmbPipeResource.PIPE_TYPE_RDWR, ctx());

            // Assert: type is named pipe and pipe type preserved

        // Arrange & Act
        Handler handler = newHandler();
        URL url = new URL(null, spec, handler);

        // Assert
        assertEquals(expectedPort, url.getPort());
    }

    @Test
    @DisplayName("parseURL with null spec throws NullPointerException")
    void testParseURL_NullSpec() throws MalformedURLException {