String logMessage = localLogMsg.get();
        assertTrue(logMessage.contains("action with tabs:"));
        assertFalse(logMessage.contains("action\twith\ttabs:"));
    }

    public void test_unsupportedKeyType() {
        Object key = new Object();
        crawlerStatsHelper.begin(key);
        crawlerStatsHelper.record(key, "test");
        crawlerStatsHelper.done(key);

        assertNull(localLogMsg.get());