String escaped = SuggestUtil.escapeWildcardQuery(query);
        assertEquals("find\\*all\\?documents.pdf", escaped);
    }

    @Test
    public void testEscapeWildcardQueryWithJapanese() {
        // Test with Japanese text containing wildcards
        String query = "テスト*検索?クエリ";
        String escaped = SuggestUtil.escapeWildcardQuery(query);
        assertEquals("テスト\\*検索\\?クエリ", escaped);