// 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

        when(tree.acquire()).thenReturn(tree);
    }

    @Test
    @DisplayName("Getters return constructor values and acquire is called")
    void gettersAndAcquire() throws Exception {
        // Arrange
        stubAcquireReturnsSelf();
        String wildcard = "*.*";
        int attrs = 123;
        FileEntry initial = entry("first");
        List<FileEntry[]> pages = List.of(new FileEntry[][] { new FileEntry[] {} });

        closeHandleCaptor = ArgumentCaptor.forClass(MsrpcSamrCloseHandle.class);
    }

    @Test
    void constructor_shouldOpenDomainSuccessfully() throws IOException {
        // Arrange
        int access = 0x01; // Example access value
        // Simulate successful RPC call
        doAnswer(invocation -> {
            MsrpcSamrOpenDomain rpc = invocation.getArgument(0);

    }

    @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

    @Mock
    Throwable mockCause;

    @Test
    @DisplayName("No-arg constructor: null message and cause; can be thrown")
    void defaultConstructor_behavesAsExpected() {
        // Arrange & Act
        SMBProtocolDecodingException ex = new SMBProtocolDecodingException();

        // Assert state
        assertNull(ex.getMessage(), "Default constructor should have null message");

    @DisplayName("openCopyTargetFile sets correct access flags depending on alsoRead")
    void openCopyTargetFile_accessMask_respectsAlsoRead(boolean alsoRead) throws Exception {
        // Arrange
        SmbFile dest = mock(SmbFile.class);
        SmbFileHandleImpl handle = mock(SmbFileHandleImpl.class);
        when(dest.openUnshared(anyInt(), anyInt(), anyInt(), anyInt(), anyInt())).thenReturn(handle);

        // Arrange
        when(negotiationResponse.isDFSSupported()).thenReturn(false);

        // Act
        boolean result = negotiationResponse.isDFSSupported();

        // Assert
        assertFalse(result);
        verify(negotiationResponse).isDFSSupported();
    }

    @Test
    @DisplayName("Test setupRequest method")
    void testSetupRequest() {
        // Arrange

        // 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 {

        // Arrange
        CIFSContext ctx = mock(CIFSContext.class);
        SmbTreeConnectionTrace trace = new SmbTreeConnectionTrace(ctx);

        // Act & Assert
        assertEquals(-1L, trace.getTreeId());
    }

    @Test
    @DisplayName("getConfig(): delegates to context")
    void getConfig_delegatesToContext() {
        // Arrange