add test and implementation for addOrUpdate listeners

src/repositories/InMemoryNotificationRepository.ts

@@ -66,6 +66,19 @@ export class InMemoryNotificationRepository implements NotificationRepository {
     }
 
     this.deviceIdsToDeliverTo[tuple.toString()][deviceId] = secondsThreshold;
+    this.listeners.forEach((listener: Listener) => {
+      const event: NotificationEvent = {
+        event: 'addOrUpdate',
+        notification: {
+          shuttleId,
+          stopId,
+          deviceId,
+          secondsThreshold
+        },
+      }
+
+      listener(event);
+    })
   }
 
   async deleteNotificationIfExists({

test/repositories/InMemoryNotificationRepositoryTests.test.ts

@@ -90,7 +90,38 @@ describe("InMemoryNotificationRepository", () => {
 
   describe("subscribeToNotificationChanges", () => {
     it("calls subscribers when something is added", async () => {
+      const mockCallback = jest.fn();
+      repo.subscribeToNotificationChanges(mockCallback);
 
+      await repo.addOrUpdateNotification(notification);
+
+      const expectedEvent: NotificationEvent = {
+        event: 'addOrUpdate',
+        notification,
+      }
+      expect(mockCallback).toHaveBeenCalledTimes(1);
+      expect(mockCallback).toHaveBeenCalledWith(expectedEvent);
+    });
+
+    it("calls subscribers when something is updated", async () => {
+      const mockCallback = jest.fn();
+      repo.subscribeToNotificationChanges(mockCallback);
+
+      await repo.addOrUpdateNotification(notification);
+
+      const updatedNotification = {
+        ...notification,
+        secondsThreshold: notification.secondsThreshold + 60,
+      };
+
+      await repo.addOrUpdateNotification(updatedNotification);
+
+      const expectedEvent: NotificationEvent = {
+        event: 'addOrUpdate',
+        notification,
+      }
+      expect(mockCallback).toHaveBeenCalledTimes(2);
+      expect(mockCallback).toHaveBeenCalledWith(expectedEvent);
     });
 
     it("calls subscribers when something is deleted", async () => {
@@ -105,9 +136,7 @@ describe("InMemoryNotificationRepository", () => {
 
       const expectedEvent: NotificationEvent = {
         event: 'delete',
-        notification: {
-          ...notification,
-        },
+        notification,
       };
       expect(mockCallback).toHaveBeenCalledWith(expectedEvent);
     });