@Test
public void testOpen_nullStartDate() {

    chatConfig.granularityMins = 1;
    chatConfig.startDate = null;
    stormConf.put(ConfigurationConstants.CHATALYTICS_CONFIG.txt, YamlUtils.writeYaml(config));
    underTest.open(stormConf, context, collector);
    verifyZeroInteractions(collector, context);
}