assertEquals(0, suggester.getAllWordsNum());
        assertEquals(0, suggester.getDocumentWordsNum());
        assertEquals(0, suggester.getQueryWordsNum());
    }

    @Test
    public void test_deleteDocumentWords() throws Exception {
        SuggestItem[] items = getItemSet1();
        suggester.indexer().index(items);
        suggester.refresh();

        assertEquals(2, suggester.getAllWordsNum());