### Question:
MaintenanceEvent extends KafkaAnomaly { @Override public String toString() { StringBuilder sb = new StringBuilder(); sb.append(String.format("{Handling %s", _maintenanceEventType)); if (_topicsWithRFUpdate != null) { sb.append(String.format(" by desired RF: [%s]", _topicsWithRFUpdate)); } else if (_brokers != null) { sb.append(String.format(" for brokers: [%s]", _brokers)); } sb.append("}"); return sb.toString(); }  @Override Supplier<String> reasonSupplier(); @Override AnomalyType anomalyType(); MaintenanceEventType maintenanceEventType(); @Override boolean fix(); @Override String toString(); @Override void configure(Map<String, ?> configs); static final String MAINTENANCE_EVENT_TYPE_CONFIG; static final String BROKERS_OBJECT_CONFIG; static final String TOPICS_WITH_RF_UPDATE_CONFIG; }### Answer:
@Test public void testToStringBeforeConfiguration() { assertNotNull(new MaintenanceEvent().toString()); }