added guardian letters with chat and multiple answer functionalities

test/push/push_tap_router_test.dart

@@ -0,0 +1,66 @@
+import 'dart:convert';
+
+import 'package:flutter_local_notifications/flutter_local_notifications.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:marianum_mobile/push/push_tap_router.dart';
+import 'package:marianum_mobile/push/push_target.dart';
+
+void main() {
+  group('resolvePushTarget', () {
+    test('a parent letter push routes by its letter id', () {
+      final target = resolvePushTarget({
+        'source': 'connect',
+        'type': 'parent-letter',
+        'parentLetterId': 'l1',
+        'event': 'reply',
+        'title': 'Hr. Müller: Wandertag',
+      });
+      expect(
+        target,
+        isA<ParentLetterTarget>().having((t) => t.letterId, 'letterId', 'l1'),
+      );
+    });
+
+    test('newsletter pushes route by newsletterId', () {
+      expect(
+        resolvePushTarget({'source': 'connect', 'newsletterId': 'n1'}),
+        isA<NewsletterTarget>().having((t) => t.newsletterId, 'id', 'n1'),
+      );
+    });
+
+    test('chat pushes accept every token key in use', () {
+      for (final key in ['chatToken', 'token', 'roomToken']) {
+        expect(
+          resolvePushTarget({key: 'abc', 'nid': 5}),
+          isA<ChatTarget>().having((t) => t.chatToken, 'chatToken', 'abc'),
+          reason: key,
+        );
+      }
+    });
+
+    test('empty ids and unrelated data name no target', () {
+      expect(resolvePushTarget({'parentLetterId': ''}), isNull);
+      expect(resolvePushTarget({'type': 'widget-refresh'}), isNull);
+      expect(resolvePushTarget({'chatToken': 7}), isNull);
+    });
+  });
+
+  group('PushTapRouter.handleResponse', () {
+    setUp(() => PushTapRouter.pendingTarget.value = null);
+
+    NotificationResponse tap(String payload) => NotificationResponse(
+      notificationResponseType: NotificationResponseType.selectedNotification,
+      payload: payload,
+    );
+
+    test('publishes the target of a tapped notification', () {
+      PushTapRouter.handleResponse(tap(jsonEncode({'parentLetterId': 'l1'})));
+      expect(PushTapRouter.pendingTarget.value, isA<ParentLetterTarget>());
+    });
+
+    test('ignores broken payloads', () {
+      PushTapRouter.handleResponse(tap('not json'));
+      expect(PushTapRouter.pendingTarget.value, isNull);
+    });
+  });
+}