// Create test directory structure with subdirectory
        File baseDir = new File(tempDir.toFile(), "images");
        File subDir = new File(baseDir, "icons");
        subDir.mkdirs();
        File validFile = new File(subDir, "icon.png");

        Boolean result = invokeIsValidUploadPath(validFile, baseDir);
        assertTrue("Valid path in subdirectory should be allowed", result);
    }

     *
     * @param offset the starting index for pagination (0-based)
     * @param size the maximum number of items to return
     * @return a PagingList containing the requested subset of mapping items
     */
    @Override
    public synchronized PagingList<CharMappingItem> selectList(final int offset, final int size) {
        if (mappingItemList == null) {
            reload(null);
        }

    }

    @Test
    public void test_isLogFilename_withPathSeparators() {
        // isLogFilename only checks the file extension, not path components
        assertTrue(AdminLogAction.isLogFilename("subdir/fess.log"));
        assertTrue(AdminLogAction.isLogFilename("../fess.log"));
    }

    // ==================================================================================

        final FessAdminAction action = createAction();
        System.setProperty("fess.var.path", varDir.toString());
        assertThrows(IllegalArgumentException.class, () -> action.validateFilePath(varDir.toString() + "/subdir/../../.."));
    }

    // ===================================================================================
    //                                                              fess.var.path Tests

                mainResult.getQueryTime(), mainResult.isPartialResults(), mainResult.getFacetResponse(), startPosition, pageSize, offset);
    }

    /**
     * Extracts a subset of documents from the full result list based on pagination parameters.
     * Applies proper bounds checking to ensure the extracted range is within the document list size.
     *