### Question:
NotificationData { public List<NotificationContent> getContentForSummaryNotification() { int size = calculateNumberOfMessagesForSummaryNotification(); List<NotificationContent> result = new ArrayList<NotificationContent>(size); Iterator<NotificationHolder> iterator = activeNotifications.iterator(); int notificationCount = 0; while (iterator.hasNext() && notificationCount < MAX_NUMBER_OF_MESSAGES_FOR_SUMMARY_NOTIFICATION) { NotificationHolder holder = iterator.next(); result.add(holder.content); notificationCount++; } return result; } NotificationData(Account account); AddNotificationResult addNotificationContent(NotificationContent content); boolean containsStarredMessages(); boolean hasSummaryOverflowMessages(); int getSummaryOverflowMessagesCount(); int getNewMessagesCount(); boolean isSingleMessageNotification(); NotificationHolder getHolderForLatestNotification(); List<NotificationContent> getContentForSummaryNotification(); int[] getActiveNotificationIds(); RemoveNotificationResult removeNotificationForMessage(MessageReference messageReference); Account getAccount(); int getUnreadMessageCount(); void setUnreadMessageCount(int unreadMessageCount); ArrayList<MessageReference> getAllMessageReferences();  }### Answer:
@Test public void testGetContentForSummaryNotification() throws Exception { notificationData.addNotificationContent(createNotificationContent("1")); NotificationContent content4 = createNotificationContent("2"); notificationData.addNotificationContent(content4); NotificationContent content3 = createNotificationContent("3"); notificationData.addNotificationContent(content3); NotificationContent content2 = createNotificationContent("4"); notificationData.addNotificationContent(content2); NotificationContent content1 = createNotificationContent("5"); notificationData.addNotificationContent(content1); NotificationContent content0 = createNotificationContent("6"); notificationData.addNotificationContent(content0); List<NotificationContent> contents = notificationData.getContentForSummaryNotification(); assertEquals(5, contents.size()); assertEquals(content0, contents.get(0)); assertEquals(content1, contents.get(1)); assertEquals(content2, contents.get(2)); assertEquals(content3, contents.get(3)); assertEquals(content4, contents.get(4)); }