feat: add alot

test/admin_pin_service_test.dart

@@ -1,52 +1,20 @@
-import 'package:flutter_secure_storage/flutter_secure_storage.dart';
 import 'package:flutter_test/flutter_test.dart';
-import 'package:kooltab2/services/admin_pin_service.dart';
-import 'package:mocktail/mocktail.dart';
+import 'package:kooltap/services/admin_pin_service.dart';
 
-class MockFlutterSecureStorage extends Mock implements FlutterSecureStorage {}
+import 'helpers/memory_secure_storage.dart';
 
 void main() {
-  late AdminPinService service;
-  late MockFlutterSecureStorage mockStorage;
-
-  setUp(() {
-    mockStorage = MockFlutterSecureStorage();
-    service = AdminPinService(storage: mockStorage);
-  });
-
   test('uses separate secure-storage keys for the admin PIN', () async {
-    when(
-      () => mockStorage.write(
-        key: any(named: 'key'),
-        value: any(named: 'value'),
-      ),
-    ).thenAnswer((_) async {});
+    final storage = MemorySecureStorage();
+    final service = AdminPinService(storage: storage);
 
     await service.setPin('1234');
 
-    verify(
-      () => mockStorage.write(
-        key: 'admin_pin_salt',
-        value: any(named: 'value'),
-      ),
-    ).called(1);
-    verify(
-      () => mockStorage.write(
-        key: 'admin_pin_hash',
-        value: any(named: 'value'),
-      ),
-    ).called(1);
-    verifyNever(
-      () => mockStorage.write(
-        key: 'pin_salt',
-        value: any(named: 'value'),
-      ),
-    );
-    verifyNever(
-      () => mockStorage.write(
-        key: 'pin_hash',
-        value: any(named: 'value'),
-      ),
+    expect(
+      storage.values.keys,
+      containsAll(['admin_pin_salt', 'admin_pin_hash']),
     );
+    expect(storage.values.keys, isNot(contains('pin_salt')));
+    expect(storage.values.keys, isNot(contains('pin_hash')));
   });
 }