Connect customer quotations and payment execution to Sendico (#50)

frontend/app/test/payout_backend_test.dart

@@ -0,0 +1,101 @@
+import 'package:flutter/material.dart';
+
+import 'package:flutter_test/flutter_test.dart';
+
+import 'package:sxchnge_kyc/sxchnge_kyc.dart';
+
+import 'package:sxchnge_wallet/sxchnge_wallet.dart';
+
+import 'package:sxchnge_app/main.dart';
+
+const destinationLabel =
+    'Saved bank ending 1234 — Personal current account for daily transfers and reimbursements';
+
+class LiveWallet extends DummyWalletService {
+  LiveWallet({this.hasMethod = true})
+    : super(DummyIdentityService(delay: Duration.zero), delay: Duration.zero);
+  final bool hasMethod;
+  String? received;
+  @override
+  bool get isSimulated => false;
+  @override
+  Future<WalletSnapshot> fetch() async => WalletSnapshot(
+    accounts: [
+      CurrencyAccount(
+        id: 'real-account',
+        currency: 'EUR',
+        precision: 2,
+        available: 7500,
+        payoutMethod: hasMethod ? 'method-ref' : '',
+        payoutLabel: hasMethod ? destinationLabel : '',
+        canFund: false,
+      ),
+    ],
+    operations: [],
+  );
+  @override
+  Future<Quote> quote(TransferRequest request) async {
+    received = request.recipient;
+    return Quote(
+      id: 'quote',
+      request: TransferRequest(
+        kind: request.kind,
+        source: request.source,
+        amount: request.amount,
+        recipient: destinationLabel,
+      ),
+      fee: 100,
+      debit: request.amount + 100,
+      credit: request.amount,
+      expiresAt: DateTime.now().add(const Duration(minutes: 5)),
+      rateNumerator: 1,
+      rateDenominator: 1,
+    );
+  }
+}
+
+void main() {
+  for (final hasMethod in [true, false]) {
+    testWidgets(
+      'backend payout ${hasMethod ? 'reviews saved destination' : 'explains missing destination'} at narrow width',
+      (t) async {
+        t.view.physicalSize = const Size(320, 1100);
+        t.view.devicePixelRatio = 1;
+        t.platformDispatcher.textScaleFactorTestValue = 1.6;
+        t.platformDispatcher.defaultRouteNameTestValue = '/payout';
+        addTearDown(t.view.resetPhysicalSize);
+        addTearDown(t.view.resetDevicePixelRatio);
+        addTearDown(t.platformDispatcher.clearTextScaleFactorTestValue);
+        addTearDown(t.platformDispatcher.clearDefaultRouteNameTestValue);
+        final wallet = LiveWallet(hasMethod: hasMethod);
+        await t.pumpWidget(SxchngeApp(walletService: wallet));
+        await t.pumpAndSettle();
+        expect(find.byKey(const ValueKey('transfer-recipient')), findsNothing);
+        await t.enterText(find.byKey(const ValueKey('transfer-amount')), '20');
+        final review = find.byKey(const ValueKey('transfer-review'));
+        await t.ensureVisible(review);
+        if (hasMethod) {
+          expect(find.text(destinationLabel), findsOneWidget);
+          await t.tap(review);
+          await t.pumpAndSettle();
+          expect(wallet.received, 'method-ref');
+          expect(find.text(destinationLabel), findsOneWidget);
+          expect(
+            find.byKey(const ValueKey('transfer-confirm')),
+            findsOneWidget,
+          );
+        } else {
+          expect(t.widget<FilledButton>(review).onPressed, isNull);
+          expect(
+            find.text(
+              'No payout destination is set up for this account. Contact support to add one.',
+            ),
+            findsOneWidget,
+          );
+        }
+        expect(t.takeException(), isNull);
+        await t.pumpWidget(const SizedBox.shrink());
+      },
+    );
+  }
+}