### Question:
WebHookHistoryRepositoryImpl implements WebHookHistoryRepository { private List<WebHookHistoryItem> findHistoryItemsInError(Collection<WebHookHistoryItem> webHookHistoryItemsCollection) { List<WebHookHistoryItem> errorItems = new ArrayList<>(); for (WebHookHistoryItem item : webHookHistoryItemsCollection) { if (item.getWebHookExecutionStats().isErrored()) { errorItems.add(item); } } return errorItems; }  @Override void addHistoryItem(WebHookHistoryItem histoyItem); @Override WebHookHistoryItem getHistoryItem(String trackingId); @Override PagedList<WebHookHistoryItem> findHistoryItemsForProject(String projectId, int pageNumber, int pageSize); @Override PagedList<WebHookHistoryItem> findHistoryItemsForBuildType(String buildTypeId, int pageNumber, int pageSize); @Override PagedList<WebHookHistoryItem> findHistoryItemsForBuild(Long buildId, int pageNumber, int pageSize); @Override PagedList<WebHookHistoryItem> findHistoryItemsForWebHookConfigId(String webHookId, int pageNumber, int pageSize); @Override Map<String, Integer> findHistoryItemCountsForWebHookConfigId(String webhookId); @Override PagedList<WebHookHistoryItem> findHistoryErroredItems(int pageNumber, int pageSize); @Override PagedList<WebHookHistoryItem> findHistoryDisabledItems(int pageNumber, int pageSize); @Override PagedList<WebHookHistoryItem> findHistoryOkItems(int pageNumber, int pageSize); @Override PagedList<WebHookHistoryItem> findHistoryAllItems(int pageNumber, int pageSize); @Override Map<LocalDate, List<WebHookHistoryItem>> findHistoryDisabledItemsGroupedByDay(LocalDate untilDate, int numberOfDays); @Override Map<LocalDate, List<WebHookHistoryItem>> findHistoryErroredItemsGroupedByDay(LocalDate untilDate, int numberOfDays); @Override Map<LocalDate, List<WebHookHistoryItem>> findHistoryOkItemsGroupedByDay(LocalDate untilDate, int numberOfDays); @Override Map<LocalDate, List<WebHookHistoryItem>> findHistoryAllItemsGroupedByDay(LocalDate untilDate, int numberOfDays); @Override int getTotalCount(); @Override int getDisabledCount(); @Override int getErroredCount(); @Override int getOkCount(); @Override int getTotalStoreItems();  }### Answer:
@Test public void testFindHistoryItemsInError() { WebHookHistoryRepository historyRepository = setupMocks(); assertEquals(1, historyRepository.findHistoryErroredItems(pageNumber, pageSize).getItems().size()); }