@Test
    void testFileSource() {
        NullPointerException e = assertThrows(
                NullPointerException.class,
                () -> new FileSource((File) null),
                "Should fail, since you must specify a file");
        assertEquals("file cannot be null", e.getMessage());
    }

    @Test
    void testGetInputStream() throws Exception {
        File txtFile = new File("target/test-classes/source.txt");

     */
    protected abstract void processRequest(Client client, Deferred<T> deferred);

    /**
     * Returns a validation error message, or null if there are no errors.
     * @return A validation error message, or null.
     */
    protected abstract String getValidationError();

        SmbComNtCancel cancelRequest = mock(SmbComNtCancel.class);

        digest.sign(data, 0, data.length, cancelRequest, null);

        verify(cancelRequest).setSignSeq(10);
        // Sequence should increment by 1 for cancel requests
    }

    @Test
    @DisplayName("Test sign method with null response")
    void testSignWithNullResponse() {

            throwValidationErrorApi(messages -> messages.addErrorsCrudCouldNotFindCrudTable(GLOBAL, id));
            return null;
        })).status(ApiResult.Status.OK).result());
    }

    // POST /api/admin/group/setting
    /**
     * Creates a new group setting.
     *
     * @param body group setting data to create

                    throwValidationErrorApi(messages -> messages.addErrorsCrudCouldNotFindCrudTable(GLOBAL, id));
                    return null;
                }))
                .status(Status.OK)
                .result());
    }

    /**
     * Creates a new boost document rule setting.
     *

        ChannelInfo leastLoadedChannel = null;
        long minPending = Long.MAX_VALUE;
        for (ChannelInfo channel : channels) {
            long pending = channel.getRequestsPending();
            if (pending < minPending) {
                minPending = pending;
                leastLoadedChannel = channel;
            }
        }
        return leastLoadedChannel != null ? leastLoadedChannel : channels.iterator().next();

        smbComOpenAndX.useUnicode = true;
        // For Unicode: 1 byte (initial null in writeBytesWireFormat)
        // + potential 1 byte alignment (in writeString) + fileName.length() * 2 + 2 bytes (terminating nulls)
        // Since headerStart is 0 and dstIndex starts at 1 (after initial null), (1-0)%2=1, so alignment byte added
        // Total: 1 + 1 + 12*2 + 2 = 28 bytes

            logger.debug("Adding {}", dataMap);
        }

        //   required check
        final Object urlObj = dataMap.get(fessConfig.getIndexFieldUrl());
        if (urlObj == null) {
            throw new DataStoreException("url is null. dataMap=" + dataMap);
        }

        final IndexingHelper indexingHelper = ComponentUtil.getIndexingHelper();

        when(session.getRequest()).thenReturn(executionRequest);

        List<Toolchain> toolchains = toolchainManager.getToolchains(session, "unknown", null);

        assertEquals(0, toolchains.size());
    }

    @Test
    void testModelNoFactory() {
        MavenSession session = mock(MavenSession.class);

        @Test
        @DisplayName("null handle throws NPE")
        void nullHandle() {
            assertThrows(NullPointerException.class, () -> new SmbPipeInputStream(null, tree));
        }

        @Test
        @DisplayName("null tree throws NPE")
        void nullTree() {
            assertThrows(NullPointerException.class, () -> new SmbPipeInputStream(handle, null));
        }
    }