Flutter-Tests: ApiClient, Offline-Queue, Login-/Objektliste-Widgets

ApiClient nimmt jetzt einen injizierbaren http.Client entgegen (Testbarkeit,
kein Verhaltensunterschied im Betrieb). Tests mocken ihn mit mocktail statt
echter Netzwerkaufrufe. offline_queue_test.dart nutzt sqflite_common_ffi
(reines Dart) für die Queue-Logik ohne Gerät/Emulator: Erfolg entfernt
Eintrag, Netzwerkfehler bleibt "wartet", 4xx setzt "fehler" ohne Auto-Retry.
Dazu Widget-Tests für Login-Flow und Objektliste-Suchfilter.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01CVgbozhYmuEhiEJHffRXCV

flutter_app/test/widget/login_screen_test.dart

@@ -0,0 +1,57 @@
+import 'dart:convert';
+
+import 'package:flutter/material.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:http/http.dart' as http;
+import 'package:mocktail/mocktail.dart';
+import 'package:shared_preferences/shared_preferences.dart';
+
+import 'package:mabea_app/api/api_client.dart';
+import 'package:mabea_app/screens/login_screen.dart';
+
+class _MockClient extends Mock implements http.Client {}
+
+void main() {
+  setUpAll(() {
+    registerFallbackValue(Uri.parse('http://test.local'));
+  });
+
+  late _MockClient httpClient;
+  late ApiClient apiClient;
+
+  setUp(() {
+    SharedPreferences.setMockInitialValues({});
+    httpClient = _MockClient();
+    apiClient = ApiClient(baseUrl: 'http://test.local/api/v1', httpClient: httpClient);
+  });
+
+  testWidgets('erfolgreicher Login navigiert zur Objektliste', (tester) async {
+    when(() => httpClient.post(any(), headers: any(named: 'headers'), body: any(named: 'body')))
+        .thenAnswer((_) async => http.Response(jsonEncode({'access_token': 'abc-token'}), 200));
+    when(() => httpClient.get(any(), headers: any(named: 'headers')))
+        .thenAnswer((_) async => http.Response(jsonEncode([]), 200));
+
+    await tester.pumpWidget(MaterialApp(home: LoginScreen(apiClient: apiClient)));
+
+    await tester.enterText(find.widgetWithText(TextField, 'Login'), 'mitarbeiter1');
+    await tester.enterText(find.widgetWithText(TextField, 'Passwort'), 'test-passwort-123');
+    await tester.tap(find.widgetWithText(FilledButton, 'Anmelden'));
+    await tester.pumpAndSettle();
+
+    expect(find.text('Objekte'), findsOneWidget);
+  });
+
+  testWidgets('falsches Passwort zeigt Fehlermeldung, bleibt auf Login', (tester) async {
+    when(() => httpClient.post(any(), headers: any(named: 'headers'), body: any(named: 'body')))
+        .thenAnswer((_) async => http.Response(jsonEncode({'detail': 'falsch'}), 401));
+
+    await tester.pumpWidget(MaterialApp(home: LoginScreen(apiClient: apiClient)));
+
+    await tester.enterText(find.widgetWithText(TextField, 'Login'), 'mitarbeiter1');
+    await tester.enterText(find.widgetWithText(TextField, 'Passwort'), 'falsch');
+    await tester.tap(find.widgetWithText(FilledButton, 'Anmelden'));
+    await tester.pumpAndSettle();
+
+    expect(find.text('Login oder Passwort falsch'), findsOneWidget);
+  });
+}

flutter_app/test/widget/objekt_list_screen_test.dart

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+import 'dart:convert';
+
+import 'package:flutter/material.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:http/http.dart' as http;
+import 'package:mocktail/mocktail.dart';
+import 'package:shared_preferences/shared_preferences.dart';
+
+import 'package:mabea_app/api/api_client.dart';
+import 'package:mabea_app/screens/objekt_list_screen.dart';
+
+class _MockClient extends Mock implements http.Client {}
+
+void main() {
+  setUpAll(() {
+    registerFallbackValue(Uri.parse('http://test.local'));
+  });
+
+  late _MockClient httpClient;
+  late ApiClient apiClient;
+
+  setUp(() {
+    SharedPreferences.setMockInitialValues({});
+    httpClient = _MockClient();
+    apiClient = ApiClient(baseUrl: 'http://test.local/api/v1', httpClient: httpClient);
+  });
+
+  testWidgets('Suche filtert nach Name und Code', (tester) async {
+    when(() => httpClient.get(any(), headers: any(named: 'headers'))).thenAnswer(
+      (_) async => http.Response(
+        jsonEncode([
+          {'id': 1, 'name': 'Rucksack Handball', 'code': 'RK-00001', 'status': 'aktiv'},
+          {'id': 2, 'name': 'Fahrzeug 2', 'code': 'FZ-00002', 'status': 'aktiv'},
+        ]),
+        200,
+      ),
+    );
+
+    await tester.pumpWidget(MaterialApp(home: ObjektListScreen(apiClient: apiClient)));
+    await tester.pumpAndSettle();
+
+    expect(find.text('Rucksack Handball'), findsOneWidget);
+    expect(find.text('Fahrzeug 2'), findsOneWidget);
+
+    await tester.enterText(find.byType(TextField).first, 'FZ-00002');
+    await tester.pumpAndSettle();
+
+    expect(find.text('Rucksack Handball'), findsNothing);
+    expect(find.text('Fahrzeug 2'), findsOneWidget);
+  });
+}