}

    @Test
    public void testGetAsList() {
        // Test with null
        List<String> nullList = SuggestUtil.getAsList(null);
        assertNotNull(nullList);
        assertEquals(0, nullList.size());

        // Test with String
        List<String> stringList = SuggestUtil.getAsList("test");
        assertNotNull(stringList);
        assertEquals(1, stringList.size());

        synonymLoader = new SynonymLoader(env, settings, expand, SynonymLoader.getAnalyzer(ignoreCase));
        if (synonymLoader.getSynonymMap() == null) {
            if (settings.getAsList("synonyms", null) != null) {
                logger.warn("synonyms values are empty.");
            } else if (settings.get("synonyms_path") != null) {

        final List<String> languages = SuggestUtil.getAsList(source.get(FieldNames.LANGUAGES));
        final List<String> kinds = SuggestUtil.getAsList(source.get(FieldNames.KINDS));
        final long timestamp = Long.parseLong(source.get(FieldNames.TIMESTAMP).toString());

        final SuggestItem item = new SuggestItem();
        item.text = text;

     * @return a list of strings representing the given object
     * @throws IllegalArgumentException if the object is not a string or a list
     */
    @SuppressWarnings("unchecked")
    public static List<String> getAsList(final Object value) {
        if (value == null) {
            return new ArrayList<>();
        }

        if (value instanceof String strValue) {
            final List<String> list = new ArrayList<>();