assertFalse("validateCalled should be false as exception thrown before flag set", extractor.isValidateCalled());
        }
    }

    /**
     * Test that validateInputStream is consistent across multiple calls.
     */
    public void test_validateInputStream_consistentAcrossMultipleCalls() {
        final InputStream in1 = new ByteArrayInputStream("data1".getBytes());

        assertNotNull(result.getContent());
        assertTrue("Should contain test content", result.getContent().contains("テスト"));
    }

    /**
     * Test that error message format is consistent and descriptive.
     */
    public void test_errorMessage_formatIsDescriptive() {
        final InputStream errorStream = new InputStream() {
            @Override
            public int read() throws IOException {

    }

    /**
     * Inner class for handling updates to the character mapping file.
     * This class manages the temporary file creation, writing operations,
     * and atomic updates to ensure data consistency during modifications.
     */
    protected class MappingUpdater implements Closeable {

        /** Flag indicating whether changes should be committed to the file. */
        protected boolean isCommit = false;

        assertTrue(id.length() <= 445);
    }

    @Test
    public void testCreateSuggestTextIdConsistency() {
        // Test that same input always produces same output
        String text = "consistency test";
        String id1 = SuggestUtil.createSuggestTextId(text);
        String id2 = SuggestUtil.createSuggestTextId(text);
        assertEquals(id1, id2);
    }

                }
            }
        }

        /**
         * Normalizes the URL string by cleaning up multiple slashes and resolving relative paths.
         * This method ensures the URL is in a consistent format for FTP operations.
         *
         * @param s The URL string to normalize
         * @return The normalized URL string
         */
        protected String normalize(final String s) {