void testInitSecContextInvalidTokenType(byte firstByte) throws Exception {
        SpnegoContext ctx = newContext();

        // Invalid first byte should be rejected by token parsing
        CIFSException ex = assertThrows(CIFSException.class, () -> ctx.initSecContext(new byte[] { firstByte }, 0, 1));
        assertEquals("Invalid token", ex.getMessage());

        // Ensure mechContext was not engaged due to early failure

    }

    @Test
    void testClose() throws CIFSException {
        assertFalse(context.isCloseCalled());

        boolean result = context.close();

        assertFalse(result); // AbstractCIFSContext always returns false for close()
        assertTrue(context.isCloseCalled());
    }

    @Test
    void testRun_successfulClose() throws CIFSException {
        // Simulate the shutdown hook being run

        // Close and verify subsequent calls throw
        handle.close();
        CIFSException ex1 = assertThrows(CIFSException.class, handle::getInput, "getInput after close must throw");
        assertTrue(ex1.getMessage().contains("Already closed"));
        CIFSException ex2 = assertThrows(CIFSException.class, handle::getOutput, "getOutput after close must throw");

    }

    /**
     * Test close method propagates exception.
     */
    @Test
    void testCloseWithException() throws CIFSException {
        // Given
        when(mockDelegate.hasNext()).thenReturn(false);
        CIFSException exception = new CIFSException("Test exception");
        doThrow(exception).when(mockDelegate).close();

    void testGetSessionKey() throws Exception {
        SmbSessionImpl session = newSession();

        // Absent key -> CIFSException
        CIFSException noKey = assertThrows(CIFSException.class, session::getSessionKey);
        assertTrue(noKey.getMessage().contains("No session key"));

        // Set a key via reflection and verify retrieval

        assertTrue(exception instanceof CIFSException);
        assertTrue(exception instanceof Exception);
        assertTrue(exception instanceof Throwable);

        // Test that it can be caught as CIFSException
        boolean caughtAsCIFSException = false;
        try {
            throw exception;
        } catch (CIFSException e) {
            caughtAsCIFSException = true;

    /**
     * Create a configuration backed by properties
     *
     * @param props properties object containing JCIFS configuration settings
     * @throws CIFSException if configuration initialization fails
     */
    public PropertyConfiguration(Properties props) throws CIFSException {
        super(false);
        initFromProperties(props);
        initDefaults(); // Use original initDefaults
    }

    /**

    @Test
    @DisplayName("getDfsReferrals handles empty name via CIFSException")
    void getDfsReferrals_emptyName() throws Exception {
        String emptyName = "";
        doThrow(new jcifs.CIFSException("invalid dfs name")).when(transport)
                .getDfsReferrals(eq(ctx), eq(emptyName), any(), any(), anyInt());

        assertThrows(jcifs.CIFSException.class, () -> transport.getDfsReferrals(ctx, emptyName, "h", "d", 1));

     * @param request the request to send
     * @param params optional request parameters
     * @return response message
     * @throws CIFSException if an error occurs sending the request
     */
    <T extends CommonServerMessageBlockResponse> T send(Request<T> request, RequestParam... params) throws CIFSException;

    void testCloseDoesNotThrowException() {
        // When & Then
        assertDoesNotThrow(() -> {
            try {
                emptyIterator.close();
            } catch (CIFSException e) {
                throw new RuntimeException(e);
            }
        }, "close() should not throw any exception");
    }

    @Test
    @DisplayName("remove should not throw any exception")