assertTrue(Arrays.asList(result).contains(SuggestItem.Kind.DOCUMENT));
    }

    @Test
    public void testEmptySource() {
        // Test setEmptySource and related methods
        String[] text = { "test" };
        String[][] readings = { { "test" } };
        SuggestItem item = new SuggestItem(text, readings, null, 0L, 0L, 1.0f, null, null, null, SuggestItem.Kind.QUERY);

    public void setKinds(final Kind[] kinds) {
        this.kinds = kinds;
    }

    /**
     * Sets the empty source map.
     * @param emptySource The empty source map to set.
     */
    public void setEmptySource(final Map<String, Object> emptySource) {
        this.emptySource = emptySource;
    }

    /**
     * Sets the ID of the suggest item.
     * @param id The ID to set.
     */

        // Take newer values from item2
        mergedItem.setTimestamp(item2.getTimestamp());
        mergedItem.setUserBoost(item2.getUserBoost());
        mergedItem.setEmptySource(item2.toEmptyMap());

        // Sum frequencies
        mergedItem.setQueryFreq(item1.getQueryFreq() + item2.getQueryFreq());
        mergedItem.setDocFreq(item1.getDocFreq() + item2.getDocFreq());