add test for failing error code

test/notifications/senders/AppleNotificationSenderTests.test.ts

@@ -120,7 +120,17 @@ describe("AppleNotificationSender", () => {
     });
 
     it('returns false if there is an error sending the notification', async () => {
+      mockHttp2Connect(403);
 
+      const notificationArguments: NotificationAlertArguments = {
+        title: 'Test notification',
+        body: 'This notification will not send',
+      }
+
+      const result = await notificationSender.sendNotificationImmediately('1', notificationArguments);
+
+      expect(http2.connect).toHaveBeenCalled();
+      expect(result).toBe(false);
     });
 
     it('does not send notification if shouldActuallySendNotifications is false', async () => {