public void testToJsonString() {
        // Test toJsonString method
        String[] text = { "json", "test" };
        String[][] readings = { { "json" }, { "test" } };
        String[] tags = { "tag1" };

        SuggestItem item = new SuggestItem(text, readings, null, 0L, 10L, 1.0f, tags, null, null, SuggestItem.Kind.QUERY);

        String json = item.toJsonString();

        assertNotNull(json);

        logger.info(msg);
        if (logger.isDebugEnabled()) {
            for (final SuggestItem item : items) {
                logger.debug("[{}] {}", type, item.toJsonString());
            }
        }
    }

    /**
     * Indexes documents from a DocumentReader asynchronously.
     * @param reader The supplier for DocumentReader.