CalendarTaskRefresher is skippable via system property.

src/main/java/de/kreth/vaadin/clubhelper/vaadinclubhelper/business/CalendarTaskRefresher.java

@@ -17,17 +17,24 @@ import de.kreth.vaadin.clubhelper.vaadinclubhelper.data.ClubEvent;
 @Component
 public class CalendarTaskRefresher {
 
+	public static final String SKIP_EVENT_UPDATE = "skipEventUpdate";
+
 	private static final long RATE = 1000L * 60 * 10;
 	private final Logger log = LoggerFactory.getLogger(getClass());
+	private final boolean skip = Boolean.parseBoolean(System.getProperty(SKIP_EVENT_UPDATE, "false"));
 
 	@Autowired
 	ClubEventDao dao;
 
-	EventBusiness business = new EventBusiness();
+	@Autowired
+	EventBusiness eventBusiness;
 
 	@Scheduled(fixedDelay = RATE)
 	public void synchronizeCalendarTasks() {
-		List<ClubEvent> events = business.loadEvents(null, true);
+		if (skip) {
+			return;
+		}
+		List<ClubEvent> events = eventBusiness.loadEvents(null, true);
 		for (ClubEvent e : events) {
 			if (dao.get(e.getId()) == null) {
 				try {
@@ -48,4 +55,8 @@ public class CalendarTaskRefresher {
 	public void setDao(ClubEventDao dao) {
 		this.dao = dao;
 	}
+
+	public void setEventBusiness(EventBusiness eventBusiness) {
+		this.eventBusiness = eventBusiness;
+	}
 }

src/test/java/de/kreth/vaadin/clubhelper/vaadinclubhelper/business/CalendarTaskRefresherTest.java

@@ -0,0 +1,46 @@
+package de.kreth.vaadin.clubhelper.vaadinclubhelper.business;
+
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.ArgumentMatchers.anyBoolean;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.when;
+
+import java.util.Collections;
+
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.mockito.Mock;
+import org.mockito.MockitoAnnotations;
+
+import de.kreth.vaadin.clubhelper.vaadinclubhelper.dao.ClubEventDao;
+
+class CalendarTaskRefresherTest {
+
+	@Mock
+	private ClubEventDao dao;
+	@Mock
+	private EventBusiness eventBusiness;
+
+	@BeforeEach
+	void setUp() throws Exception {
+		MockitoAnnotations.initMocks(this);
+		when(eventBusiness.loadEvents(any(), anyBoolean())).thenReturn(Collections.emptyList());
+	}
+
+	@Test
+	void testSkip() {
+		CalendarTaskRefresher r = new CalendarTaskRefresher();
+		r.setDao(dao);
+		r.setEventBusiness(eventBusiness);
+		r.synchronizeCalendarTasks();
+		verify(eventBusiness).loadEvents(any(), anyBoolean());
+		System.setProperty(CalendarTaskRefresher.SKIP_EVENT_UPDATE, Boolean.TRUE.toString());
+
+		r = new CalendarTaskRefresher();
+		r.setDao(dao);
+		r.setEventBusiness(eventBusiness);
+		r.synchronizeCalendarTasks();
+		verify(eventBusiness).loadEvents(any(), anyBoolean());
+	}
+
+}