systemHelper.setForceStop(true);
        assertTrue(systemHelper.isForceStop());
        systemHelper.setForceStop(false);
        assertFalse(systemHelper.isForceStop());
    }

    public void test_generateDocId() {
        final String docId = systemHelper.generateDocId(Collections.emptyMap());
        assertNotNull(docId);
        assertEquals(32, docId.length());
    }

    public void test_abbreviateLongText() {