suggester.createIndexIfNothing();

        assertEquals("Empty index should have 0 document words", 0, suggester.getDocumentWordsNum());
    }

    @Test
    public void test_getQueryWordsNum_onEmptyIndex() throws Exception {
        Suggester suggester = createSuggester();
        suggester.createIndexIfNothing();

        assertEquals("Empty index should have 0 query words", 0, suggester.getQueryWordsNum());