### Question:
TerminateExternalDatabaseHandler implements EventHandler<TerminateExternalDatabaseRequest> { @Override public void accept(Event<TerminateExternalDatabaseRequest> terminateExternalDatabaseRequest) { LOGGER.debug("In TerminateExternalDatabaseHandler.accept"); TerminateExternalDatabaseRequest request = terminateExternalDatabaseRequest.getData(); Stack stack = request.getStack(); DatabaseAvailabilityType externalDatabase = ObjectUtils.defaultIfNull(stack.getExternalDatabaseCreationType(), DatabaseAvailabilityType.NONE); LOGGER.debug("External database: {} for stack {}", externalDatabase.name(), stack.getName()); Selectable result; try { if (externalDatabase == DatabaseAvailabilityType.NONE) { LOGGER.info("External database for stack {} is not requested. Termination is not necessary.", stack.getName()); result = new TerminateExternalDatabaseResult(stack.getId(), EXTERNAL_DATABASE_WAIT_TERMINATION_SUCCESS_EVENT.event(), stack.getName(), null); } else { LOGGER.debug("Updating stack {} status from {} to {}", stack.getName(), stack.getStatus().name(), DetailedStackStatus.EXTERNAL_DATABASE_DELETION_IN_PROGRESS.name()); stackUpdaterService.updateStatus(stack.getId(), DetailedStackStatus.EXTERNAL_DATABASE_DELETION_IN_PROGRESS, ResourceEvent.CLUSTER_EXTERNAL_DATABASE_DELETION_STARTED, "External database deletion in progress"); LOGGER.debug("Getting environment CRN for stack {}", stack.getName()); DetailedEnvironmentResponse environment = environmentClientService.getByCrn(stack.getEnvironmentCrn()); terminationService.terminateDatabase(stack.getCluster(), externalDatabase, environment, request.isForced()); LOGGER.debug("Updating stack {} status from {} to {}", stack.getName(), stack.getStatus().name(), DetailedStackStatus.DELETE_COMPLETED.name()); stackUpdaterService.updateStatus(stack.getId(), DetailedStackStatus.DELETE_COMPLETED, ResourceEvent.CLUSTER_EXTERNAL_DATABASE_DELETION_FINISHED, "External database deletion finished"); result = new TerminateExternalDatabaseResult(stack.getId(), EXTERNAL_DATABASE_WAIT_TERMINATION_SUCCESS_EVENT.event(), stack.getName(), stack.getCluster().getDatabaseServerCrn()); } } catch (UserBreakException e) { LOGGER.info("Database termination polling exited before timeout. Cause: ", e); result = terminateFailedEvent(stack, e); } catch (PollerStoppedException e) { LOGGER.info(String.format("Database termination poller stopped for stack: %s", stack.getName()), e); result = terminateFailedEvent(stack, e); } catch (PollerException e) { LOGGER.info(String.format("Database termination polling failed for stack: %s", stack.getName()), e); result = terminateFailedEvent(stack, e); } catch (Exception e) { LOGGER.error(String.format("Exception during DB termination for stack/cluster: %s", stack.getName()), e); result = terminateFailedEvent(stack, e); } LOGGER.debug("Sending reactor notification for selector {}", result.selector()); eventBus.notify(result.selector(), new Event<>(terminateExternalDatabaseRequest.getHeaders(), result)); }  @Override String selector(); @Override void accept(Event<TerminateExternalDatabaseRequest> terminateExternalDatabaseRequest);  }### Answer:
@Test void acceptDbNone() { Stack stack = buildStack(DatabaseAvailabilityType.NONE); TerminateExternalDatabaseRequest request = new TerminateExternalDatabaseRequest(STACK_ID, "selector", "resourceName", "crn", stack, false); Event<TerminateExternalDatabaseRequest> event = new Event<>(EVENT_HEADERS, request); underTest.accept(event); verifyNoMoreInteractions(terminationService); verifyNoMoreInteractions(stackUpdaterService); ArgumentCaptor<Event<TerminateExternalDatabaseResult>> eventCaptor = ArgumentCaptor.forClass(Event.class); verify(eventBus).notify(eq("TerminateExternalDatabaseResult"), eventCaptor.capture()); Event<TerminateExternalDatabaseResult> value = eventCaptor.getValue(); assertThat(value.getHeaders()).isEqualTo(EVENT_HEADERS); assertThat(value.getData().getResourceCrn()).isNull(); }