implemented RMV public transit module including trip search, station departures, and nearby stop lookup, added "Marianum Connect" API integration with bearer token authentication and auto-refresh logic, integrated geolocator for location-based station search, added persistent storage for favorite stations and recent trip queries, and implemented comprehensive UI for journey details, trip results, and disruption alerts

test/api/connect/iso_duration_test.dart

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+import 'package:flutter_test/flutter_test.dart';
+import 'package:marianum_mobile/api/connect/rmv/iso_duration.dart';
+
+void main() {
+  group('IsoDuration.fromJson', () {
+    test('null and empty return null', () {
+      expect(IsoDuration.fromJson(null), isNull);
+      expect(IsoDuration.fromJson(''), isNull);
+    });
+
+    test('hours-minutes-seconds parse correctly', () {
+      expect(
+        IsoDuration.fromJson('PT1H30M15S'),
+        const Duration(hours: 1, minutes: 30, seconds: 15),
+      );
+    });
+
+    test('hours only', () {
+      expect(IsoDuration.fromJson('PT2H'), const Duration(hours: 2));
+    });
+
+    test('minutes only', () {
+      expect(IsoDuration.fromJson('PT45M'), const Duration(minutes: 45));
+    });
+
+    test('seconds with fraction', () {
+      expect(
+        IsoDuration.fromJson('PT30.5S'),
+        const Duration(milliseconds: 30500),
+      );
+    });
+
+    test('invalid string returns null', () {
+      expect(IsoDuration.fromJson('not a duration'), isNull);
+    });
+  });
+
+  group('IsoDuration.toJson', () {
+    test('null returns null', () => expect(IsoDuration.toJson(null), isNull));
+
+    test('zero duration formats as PT0S', () {
+      expect(IsoDuration.toJson(Duration.zero), 'PT0S');
+    });
+
+    test('hours and minutes only formats without seconds', () {
+      expect(
+        IsoDuration.toJson(const Duration(hours: 1, minutes: 30)),
+        'PT1H30M',
+      );
+    });
+
+    test('full duration roundtrips through parse', () {
+      const original = Duration(hours: 2, minutes: 15, seconds: 7);
+      expect(IsoDuration.fromJson(IsoDuration.toJson(original)), original);
+    });
+  });
+}

test/api/connect/rmv_upstream_exception_test.dart

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+import 'package:flutter_test/flutter_test.dart';
+import 'package:marianum_mobile/api/connect/errors/rmv_upstream_exception.dart';
+
+void main() {
+  group('RmvUpstreamException', () {
+    test('H390 maps to no-connection message', () {
+      final e = RmvUpstreamException(errorCode: 'H390');
+      expect(e.userMessage, contains('Keine Verbindung'));
+    });
+
+    test('H891 maps to invalid-station message', () {
+      final e = RmvUpstreamException(errorCode: 'H891');
+      expect(e.userMessage, contains('ungültig'));
+    });
+
+    test('unknown code falls through to a generic but specific message', () {
+      final e = RmvUpstreamException(errorCode: 'HXYZ');
+      expect(e.userMessage, contains('HXYZ'));
+    });
+
+    test('null code yields the generic upstream message', () {
+      final e = RmvUpstreamException(errorCode: null);
+      expect(e.userMessage, contains('keine Antwort'));
+    });
+  });
+}