feat(buy): hint savings plan can be set up recurring and multiple times

assets/languages/strings_de.arb

@@ -35,6 +35,7 @@
   "buyPaymentInformationDescription": "Bitte überweisen Sie den Kaufbetrag mit diesen Angaben über Ihre Bankanwendung. Der Verwendungszweck ist wichtig!",
   "buyRealUnit": "RealUnit kaufen",
   "buyRealu": "RealUnit Token kaufen",
+  "buyRecurringPaymentHint": "Tipp: Richten Sie mit diesen Angaben einen wiederkehrenden Dauerauftrag bei Ihrer Bank ein, um regelmässig zu investieren. Sie können auch mehrere Sparpläne parallel mit unterschiedlichen Beträgen oder Intervallen anlegen.",
   "cancel": "Abbrechen",
   "changeAddress": "Adresse ändern",
   "changeInReview": "Änderung in Prüfung",

assets/languages/strings_en.arb

@@ -35,6 +35,7 @@
   "buyPaymentInformationDescription": "Please transfer the purchase amount using your banking app with these details. The purpose of payment is important!",
   "buyRealUnit": "Buy RealUnit",
   "buyRealu": "Buy RealUnit Token",
+  "buyRecurringPaymentHint": "Tip: set up a recurring bank standing order with these details to invest regularly. You can also create several plans in parallel with different amounts or intervals.",
   "cancel": "Cancel",
   "changeAddress": "Change address",
   "changeInReview": "Change in review",

lib/screens/buy/widgets/payment_information_details.dart

@@ -109,6 +109,22 @@ class PaymentInformationDetailsView extends StatelessWidget {
                       ),
                     ],
                   ),
+                  Row(
+                    spacing: 12,
+                    children: [
+                      const Icon(
+                        Icons.autorenew,
+                        size: 24,
+                        color: RealUnitColors.realUnitBlue,
+                      ),
+                      Expanded(
+                        child: Text(
+                          S.of(context).buyRecurringPaymentHint,
+                          style: Theme.of(context).textTheme.bodyMedium,
+                        ),
+                      ),
+                    ],
+                  ),
                 ],
               ),
               Column(

test/screens/buy/widgets/payment_information_details_test.dart

@@ -0,0 +1,68 @@
+import 'package:bloc_test/bloc_test.dart';
+import 'package:flutter/material.dart';
+import 'package:flutter_bloc/flutter_bloc.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:mocktail/mocktail.dart';
+import 'package:realunit_wallet/generated/i18n.dart';
+import 'package:realunit_wallet/packages/service/dfx/models/payment/buy/buy_payment_info.dart';
+import 'package:realunit_wallet/screens/buy/cubits/buy_confirm/buy_confirm_cubit.dart';
+import 'package:realunit_wallet/screens/buy/widgets/payment_information_details.dart';
+import 'package:realunit_wallet/styles/colors.dart';
+import 'package:realunit_wallet/styles/currency.dart';
+
+import '../../../helper/helper.dart';
+
+class _MockBuyConfirmCubit extends MockCubit<BuyConfirmState> implements BuyConfirmCubit {}
+
+void main() {
+  late _MockBuyConfirmCubit confirmCubit;
+
+  const buyPaymentInfo = BuyPaymentInfo(
+    id: 1,
+    iban: 'CH00 0000 0000 0000 0000 0',
+    bic: 'BICCBIC',
+    name: 'RealUnit AG',
+    street: 'Bahnhofstrasse',
+    number: '1',
+    zip: '8001',
+    city: 'Zurich',
+    country: 'Switzerland',
+    currency: Currency.chf,
+  );
+
+  setUp(() {
+    confirmCubit = _MockBuyConfirmCubit();
+    when(() => confirmCubit.state).thenReturn(const BuyConfirmInitial());
+  });
+
+  Widget buildSubject() => BlocProvider<BuyConfirmCubit>.value(
+    value: confirmCubit,
+    child: const Scaffold(
+      body: SingleChildScrollView(
+        child: PaymentInformationDetailsView(
+          buyPaymentInfo: buyPaymentInfo,
+          amount: '100',
+        ),
+      ),
+    ),
+  );
+
+  group('$PaymentInformationDetailsView recurring/multiple-plans hint', () {
+    testWidgets('renders the recurring savings-plan hint text', (tester) async {
+      await tester.pumpApp(buildSubject());
+
+      expect(
+        find.text(S.current.buyRecurringPaymentHint),
+        findsOneWidget,
+      );
+    });
+
+    testWidgets('renders the autorenew icon in RealUnit blue for the hint', (tester) async {
+      await tester.pumpApp(buildSubject());
+
+      final icon = tester.widget<Icon>(find.byIcon(Icons.autorenew));
+      expect(icon.color, RealUnitColors.realUnitBlue);
+      expect(icon.size, 24);
+    });
+  });
+}