when(sidResolver.getServerSid(eq(null), anyString())).thenThrow(new CIFSException("Context cannot be null"));

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

    @Test
    void testGetServerSid_NullServerName() throws CIFSException {
        when(sidResolver.getServerSid(any(CIFSContext.class), eq(null))).thenThrow(new CIFSException("Server name cannot be null"));

    }

    @Test
    @DisplayName("hasCapability(cap): propagates CIFSException on failure")
    void hasCapability_throws() throws Exception {
        // Arrange
        when(handle.hasCapability(anyInt())).thenThrow(new CIFSException("capability check failed"));

        // Act + Assert
        CIFSException ex = assertThrows(CIFSException.class, () -> handle.hasCapability(42));

        // Arrange
        NetbiosAddress inputAddress = mock(NetbiosAddress.class);
        when(nameServiceClient.getNbtAllByAddress(inputAddress)).thenThrow(new UnknownHostException("Host not found"));

        // Act & Assert
        assertThrows(UnknownHostException.class, () -> nameServiceClient.getNbtAllByAddress(inputAddress));

            when(locator.getURL()).thenReturn(anyUrlWithEmptyHost);
            // Simulate failure to find master browser (UnknownHost wrapped in CIFSException)
            when(locator.getAddress()).thenThrow(new CIFSException("no master", new UnknownHostException("MB")));

            // Act + Assert: the code maps this case to SmbUnsupportedOperationException

            // Given
            when(transportPool.getSmbTransport(context, "unknown.host", DEFAULT_PORT, false, false))
                    .thenThrow(new UnknownHostException("Unknown host"));

            // When & Then
            assertThrows(UnknownHostException.class,

    /**
     * Test for unwrap() method throwing exception.
     * Verifies that unwrap can throw exceptions when appropriate.
     */
    @Test
    void testUnwrap_throwsException() {
        when(smbTree.unwrap(any())).thenThrow(new ClassCastException("Cannot unwrap to specified type"));

        assertThrows(ClassCastException.class, () -> smbTree.unwrap(CustomSmbTree.class),
                "Should throw ClassCastException when type is incompatible");

        // Arrange
        SmbPipeOutputStream out = newStream();
        CIFSException boom = new CIFSException("tree-fail");
        when(handle.ensureTreeConnected()).thenThrow(boom);

        // Act + Assert
        CIFSException ex = assertThrows(CIFSException.class, out::ensureTreeConnected);
        assertEquals("tree-fail", ex.getMessage());

    }

    @Test
    @DisplayName("send throws CIFSException for null request when implementation does")
    void send_nullRequest_throws() throws Exception {
        // Arrange
        when(tree.send(isNull())).thenThrow(new CIFSException("null request"));

        // Act
        CIFSException ex = assertThrows(CIFSException.class, () -> tree.send(null));

        // Assert
        assertEquals("null request", ex.getMessage());

    @Test
    @DisplayName("overlaps throws CIFSException when implementation fails")
    void overlapsThrowsCifsException() throws Exception {
        when(locator.overlaps(any())).thenThrow(new CIFSException("Simulated failure"));

        CIFSException ex = assertThrows(CIFSException.class, () -> locator.overlaps(other));
        assertTrue(ex.getMessage().contains("Simulated failure"));

        // Configure the tree to throw transport error on first call, succeed on second
        when(tree.send(eq(req), eq(resp), anySet()))
                .thenThrow(new SmbException("transport error", new jcifs.util.transport.TransportException()))
                .thenReturn(resp);

        setTree(c, tree);