assertTrue(items.size() > 0);
        SuggestItem item = items.get(0);
        assertTrue("Should have language", item.getLanguages().length > 0);
        assertEquals("ja", item.getLanguages()[0]);
    }

    @Test
    public void test_parseDocument_withNullLanguage() throws Exception {
        Map<String, Object> document = new HashMap<>();

        this.includesDependencies = includesDependencies;
    }

    @Override
    public boolean isIncludesDependencies() {
        return includesDependencies;
    }

    public void setLanguage(String language) {
        this.language = language;
    }

    @Override
    public String getLanguage() {
        return language;
    }

    @Deprecated

     */
    public String[] getLanguages(final HttpServletRequest request, final SearchRequestParams params) {
        final SystemHelper systemHelper = ComponentUtil.getSystemHelper();
        if (params.getLanguages() != null) {
            final Set<String> langSet = new HashSet<>();
            for (final String lang : params.getLanguages()) {

            }

            @Override
            public Map<String, String[]> getConditions() {
                return conditions;
            }

            @Override
            public String[] getLanguages() {
                return null;
            }

            @Override
            public GeoInfo getGeoInfo() {
                return null;
            }

            @Override

    }

    @Override
    public String getLanguage() {
        if (language == null) {
            return "none";
        }

        return language;
    }

    public void setLanguage(final String language) {
        this.language = language;
    }

    @Override
    @Deprecated
    public boolean isAddedToClasspath() {
        return addedToClasspath;
    }

    @Deprecated

            if (virtualHost != null) {
                tags.add(virtualHost);
            }

            if (sb.length() > 0) {
                final String[] langs = searchLog.getLanguages() == null ? new String[] {} : searchLog.getLanguages().split(",");
                stream(searchLog.getRoles()).of(stream -> stream.forEach(role -> roles.add(role)));

            num = fessConfig.getPagingSearchPageMaxSizeAsInteger();
        }
        return num;
    }

    @Override
    public String[] getLanguages() {
        return stream(lang).get(stream -> stream.filter(StringUtil::isNotBlank).distinct().toArray(n -> new String[n]));
    }

    @Override
    public GeoInfo getGeoInfo() {
        return null;
    }

        SuggestItem item2 = createItemWithLanguages("text", "ja", "zh");

        SuggestItem merged = SuggestItemMerger.merge(item1, item2);

        String[] languages = merged.getLanguages();
        Set<String> langSet = new HashSet<>(Arrays.asList(languages));

        assertEquals(3, langSet.size());
        assertTrue(langSet.contains("en"));
        assertTrue(langSet.contains("ja"));

    }

    @Override
    public Map<String, String[]> getFields() {
        return fields;
    }

    @Override
    public String[] getLanguages() {
        return stream(lang).get(stream -> stream.filter(StringUtil::isNotBlank).distinct().toArray(n -> new String[n]));
    }

    @Override
    public GeoInfo getGeoInfo() {

            return null;
        }

        @Override
        public Map<String, String[]> getConditions() {
            return null;
        }

        @Override
        public String[] getLanguages() {
            return null;
        }

        @Override
        public GeoInfo getGeoInfo() {
            return null;
        }

        @Override
        public FacetInfo getFacetInfo() {