public QueryCacheConfig addEntryListenerConfig(EntryListenerConfig listenerConfig) {
        checkNotNull(listenerConfig, "listenerConfig cannot be null");

        getEntryListenerConfigs().add(listenerConfig);
        return this;
    }
@Test(expected = NullPointerException.class)
    public void testAddEntryListenerConfig_throwsException_whenNull() {
        QueryCacheConfig config = new QueryCacheConfig();
        config.addEntryListenerConfig(null);
    }