FullWidthToHalfWidthAlphabetNormalizer normalizer = new FullWidthToHalfWidthAlphabetNormalizer();

        String result = normalizer.normalize("０１２３４５６７８９", "field");

        assertEquals("0123456789", result);
    }

    @Test
    public void test_mixedFullWidthAlphanumeric() throws Exception {

    }

    public void test_readBytesWithOffset_delegatesToUnderlying() throws IOException {
        // Test that read(byte[], int, int) delegates to underlying stream
        byte[] data = "0123456789".getBytes();
        InputStream underlyingStream = new ByteArrayInputStream(data);
        IgnoreCloseInputStream stream = new IgnoreCloseInputStream(underlyingStream);

        byte[] buffer = new byte[10];

        // Test write(byte[], int, int) method
        ContentOutputStream cos = new ContentOutputStream(10, Curl.tmpDir);
        byte[] data = new byte[] { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 };
        cos.write(data, 2, 3); // Write bytes at index 2, 3, 4
        assertTrue(cos.isInMemory());
        cos.close();
    }

    @Test

     */
    @Test
    public void testIsNumver() throws Exception {
        assertFalse(StringUtil.isNumber(null));
        assertTrue(StringUtil.isNumber("0123456789"));
        assertFalse(StringUtil.isNumber("aaaBBBccc"));
        assertFalse(StringUtil.isNumber("０１２３４５６７８９"));
        assertFalse(StringUtil.isNumber(""));
        assertFalse(StringUtil.isNumber("01234abcdef"));
        assertFalse(StringUtil.isNumber("abcdef01234"));

        // Create a temporary file with test data
        File tempFile = File.createTempFile("test-", ".tmp");
        try (FileOutputStream fos = new FileOutputStream(tempFile)) {
            fos.write("0123456789".getBytes());
        }

        try (TemporaryFileInputStream stream = new TemporaryFileInputStream(tempFile)) {
            long skipped = stream.skip(5);
            assertEquals(5, skipped);

        // Test text that exceeds maximum length after encoding
        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < 500; i++) {
            sb.append("0123456789");
        }
        String longText = sb.toString();
        String id = SuggestUtil.createSuggestTextId(longText);
        assertNotNull(id);