// Test that method is case sensitive (as per implementation)
        assertNull(languageHelper.getSupportedLanguage("JA"));
        assertNull(languageHelper.getSupportedLanguage("EN"));
        assertEquals("ja", languageHelper.getSupportedLanguage("ja"));
        assertEquals("en", languageHelper.getSupportedLanguage("en"));
    }

    @Test
    public void test_updateDocument_emptyLangFields() {

        assertArrays(new String[] { "ja" }, fessConfig.normalizeQueryLanguages(new String[] { "ja-jp" }));
        assertArrays(new String[] { "ja" }, fessConfig.normalizeQueryLanguages(new String[] { "ja_JP" }));
        assertArrays(new String[] { "ja", "zh-cn" }, fessConfig.normalizeQueryLanguages(new String[] { "ja", "zh" }));

        value = " ja ";
        assertEquals("ja", systemHelper.normalizeLang(value));

        value = "ja-JP";
        assertEquals("ja", systemHelper.normalizeLang(value));

        value = "ja_JP";
        assertEquals("ja", systemHelper.normalizeLang(value));

        value = "ja_JP_AAA";
        assertEquals("ja", systemHelper.normalizeLang(value));

        value = "zh";

    @Test
    public void test_serializeParameters() {
        RequestParameter[] params = new RequestParameter[] { new RequestParameter("q", new String[] { "test" }),
                new RequestParameter("lang", new String[] { "en", "ja" }) };
        String encoded = searchHelper.serializeParameters(params);
        assertNotNull(encoded);
        byte[] compressed = Base64.getUrlDecoder().decode(encoded);

			<arg>"fess"</arg>
			<arg>"it/protwords.txt"</arg>
		</postConstruct>
		<postConstruct name="addConfigFile">
			<arg>"fess"</arg>
			<arg>"ja/kuromoji.txt"</arg>
		</postConstruct>
		<postConstruct name="addConfigFile">
			<arg>"fess"</arg>
			<arg>"ja/mapping.txt"</arg>
		</postConstruct>
		<postConstruct name="addConfigFile">
			<arg>"fess"</arg>
			<arg>"ko/nori.txt"</arg>
		</postConstruct>

          "type": "mapping",
          "mappings_path": "${fess.dictionary.path}fa/mapping.txt"
        },
        "mapping_ja_filter": {
          "type": "mapping",
          "mappings_path": "${fess.dictionary.path}ja/mapping.txt"
        },
        "mapping_filter": {
          "type": "mapping",
          "mappings_path": "${fess.dictionary.path}mapping.txt"
        },
        "traditional_chinese_convert": {

        final Map<String, Object> source = new LinkedHashMap<>();
        source.put("title", "My Title");
        source.put("content", "My Content");
        source.put("lang", "ja");
        source.put("url", "https://example.com/");

        final String html = new HtmlIndexExportFormatter().format(source, Collections.emptySet());

        assertFalse(html.contains("fess:title"));

            public String getQueryLanguageMapping() {
                return "en:en,ja:ja";
            }

            @Override
            public String getQueryDefaultLanguages() {
                return "en,ja";
            }

            @Override
            public String[] getQueryAdditionalResponseFields(String... fields) {
                return fields;
            }

            @Override

        },
        "lithuanian_stop": {
          "type":       "stop",

        },
        "lithuanian_stop": {
          "type":       "stop",