byte[] buf = new byte[4];

        // Act/Assert
        assertThrows(ArrayIndexOutOfBoundsException.class, () -> req.writeBytesWireFormat(buf, -1));
    }

    @Test
    @DisplayName("readBytesWireFormat returns 0 and tolerates null buffer")
    void readBytesWireFormat_returnsZeroEvenWithNull() {
        // Arrange
        Smb2LogoffRequest req = newRequest();

        // Act

    @Test
    @DisplayName("Constructor accepts a Configuration and creates instance")
    void constructor_happyPath() {
        // Arrange
        Configuration cfg = Mockito.mock(Configuration.class);

        // Act
        Smb2LogoffResponse resp = new Smb2LogoffResponse(cfg);

        // Assert
        assertNotNull(resp, "Response instance should be created");
    }

    @Nested
    @DisplayName("writeBytesWireFormat")

    @MethodSource("intErrorCodes")
    @DisplayName("int ctor: sets message and NT status as expected")
    void intConstructor_populatesMessageAndStatus(int errCode, int expectedStatus) {
        // Arrange & Act: create exception with error code
        SmbAuthException ex = new SmbAuthException(errCode);

        // Assert: type, message derived from code, status mapping, and no cause
        assertNotNull(ex);

        return new Handler(ctx);
    }

    @Test
    @DisplayName("getDefaultPort returns SMB default port")
    void testGetDefaultPort() {
        // Arrange
        Handler handler = newHandler();
        // Act & Assert
        assertEquals(SmbConstants.DEFAULT_PORT, handler.getDefaultPort(), "Default port should match SmbConstants");
    }

    @Test
    @DisplayName("openConnection returns SmbFile using provided CIFSContext")

        // Act
        int actual = findNtStatusOrMinusOne(dosCode);

        // Assert
        assertEquals(expectedNtStatus, actual, "Mapping must match table entry");
    }

    @Test
    @DisplayName("Edge: zero DOS code maps to zero NTSTATUS")
    void zeroCodeMapsToZero() {
        // Act
        int actual = findNtStatusOrMinusOne(0x00000000);

    @Test
    void testClose() throws Exception {
        // Act
        smbTransport.close();

        // Assert
        verify(smbTransport).close(); // Verify that the close method was called
    }

    @Test
    void testGetRemoteAddress() {
        // Arrange
        when(smbTransport.getRemoteAddress()).thenReturn(remoteAddress);

        // Act
        Address result = smbTransport.getRemoteAddress();

            assertEquals("smb://localhost/share/file.txt", smbFile.getCanonicalPath());
        }

        @Test
        void testGetServer() {
            // Act & Assert
            assertEquals("localhost", smbFile.getServer());
        }

        @Test
        void testGetShare() {
            // Act & Assert
            assertEquals("share", smbFile.getShare());
        }

        @Test

    @Test
    @DisplayName("Constructor with CIFSContext: creates instance")
    void constructor_withContext_createsInstance() {
        // Arrange
        CIFSContext ctx = mock(CIFSContext.class);

        // Act
        SmbTreeConnectionTrace trace = new SmbTreeConnectionTrace(ctx);

        // Assert
        assertNotNull(trace, "Instance should be created");
    }

    @Test

        boolean result = negotiationResponse.isDFSSupported();

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

    @Test
    @DisplayName("Test setupRequest method")
    void testSetupRequest() {
        // Arrange
        doNothing().when(negotiationResponse).setupRequest(serverMessageBlock);

        // Act

        boolean guest = flags[1];

        // Arrange
        Subject subject = new Subject();
        TestCredentials creds = new TestCredentials("DOMAIN", anonymous, guest, subject, false);

        // Act & Assert
        // unwrap to interface itself should return same instance
        CredentialsInternal unwrapped = creds.unwrap(CredentialsInternal.class);