try {
            assertEquals(0L, suggestHelper.getQueryWordsNum());
        } catch (Exception e) {
            assertTrue(true);
        }
    }

    public void test_deleteAllWords() {
        try {
            assertFalse(suggestHelper.deleteAllWords());
        } catch (Exception e) {
            assertTrue(true);
        }
    }

    public void test_deleteDocumentWords() {