assertNull(exception.getCause());
    }

    @Test
    public void test_constructor_withUnicodeCharacters() {
        // Test with username containing Unicode characters
        String username = "ユーザー名";
        FessUserNotFoundException exception = new FessUserNotFoundException(username);

        assertNotNull(exception);

package schema

import (
	"crypto/sha1"
	"encoding/hex"
	"regexp"
	"strings"
	"unicode/utf8"

	"github.com/jinzhu/inflection"
	"golang.org/x/text/cases"
	"golang.org/x/text/language"
)

// Namer namer interface
type Namer interface {
	TableName(table string) string
	SchemaName(table string) string
	ColumnName(table, column string) string
	JoinTableName(joinTable string) string
	RelationshipFKName(Relationship) string

pkg unicode, var Common *RangeTable
pkg unicode, var Coptic *RangeTable
pkg unicode, var Cs *RangeTable
pkg unicode, var Cuneiform *RangeTable
pkg unicode, var Cypriot *RangeTable
pkg unicode, var Cyrillic *RangeTable
pkg unicode, var Dash *RangeTable
pkg unicode, var Deprecated *RangeTable
pkg unicode, var Deseret *RangeTable
pkg unicode, var Devanagari *RangeTable

        final int start = bufferIndex;

        pathConsumed = readInt2(buffer, bufferIndex);
        bufferIndex += 2;
        /* Samba 2.2.8a will reply with Unicode paths even though
         * ASCII is negotiated so we must use flags2 (probably
         * should anyway).
         */
        if ((flags2 & FLAGS2_UNICODE) != 0) {
            pathConsumed /= 2;
        }

        assertEquals("query:", Constants.FACET_QUERY_PREFIX);
    }

    @Test
    public void test_unicode_base64_encoding() {
        // Test that unicode strings are properly encoded/decoded
        String unicodeString = "日本語テスト";
        String encoded = BaseEncoding.base64().encode(unicodeString.getBytes(StandardCharsets.UTF_8));
        String decoded = new String(BaseEncoding.base64().decode(encoded), StandardCharsets.UTF_8);

        int notifyOffset = 80;
        SMBUtil.writeInt4(0, buffer, notifyOffset); // NextEntryOffset (0 = last entry)
        SMBUtil.writeInt4(1, buffer, notifyOffset + 4); // Action (FILE_ACTION_ADDED)
        // Write filename in Unicode
        String fileName = "test.txt";
        byte[] fileNameBytes = fileName.getBytes("UnicodeLittleUnmarked");
        SMBUtil.writeInt4(fileNameBytes.length, buffer, notifyOffset + 8); // FileNameLength

/**
 * The {@code Hc5IdnDnsResolver} class implements the {@code DnsResolver} interface
 * for Apache HttpComponents 5.x to provide DNS resolution with support for
 * Internationalized Domain Names (IDN).
 * It converts Unicode domain names to ASCII Compatible Encoding (ACE) using the
 * {@link java.net.IDN} class.
 *
 * <p>This class allows setting a custom flag for the IDN conversion and a custom
 * encoding for URL decoding.</p>
 *

        assertEquals(statusCode, exception.getStatusCode());
        assertEquals(message, exception.getMessage());
    }

    @Test
    public void test_exceptionWithUnicodeMessage() {
        // Test with unicode characters in message
        int statusCode = 422;
        String message = "エラー: 無効なリクエスト 错误：无效请求 오류: 잘못된 요청";

        WebApiException exception = new WebApiException(statusCode, message);

    /**
     * NTLMSSP Type 3 message identifier.
     */
    protected static final int NTLMSSP_TYPE3 = 0x3;

    private static final String OEM_ENCODING = SmbConstants.DEFAULT_OEM_ENCODING;
    /**
     * Unicode encoding used for NTLM messages.
     */
    protected static final String UNI_ENCODING = "UTF-16LE";

    private int flags;

    /**
     * Returns the flags currently in use for this message.
     *

            { (byte) 'N', (byte) 'T', (byte) 'L', (byte) 'M', (byte) 'S', (byte) 'S', (byte) 'P', (byte) 0 };

    private static final String OEM_ENCODING = Config.DEFAULT_OEM_ENCODING;
    /**
     * Unicode encoding used for NTLM messages.
     */
    protected static final String UNI_ENCODING = "UTF-16LE";

    private int flags;

    /**
     * Returns the flags currently in use for this message.
     *