Add saved payout destination UX and service contracts (#54)

frontend/app/test/two_factor_test.dart

@@ -6,9 +6,15 @@ import 'package:sxchnge_analytics/sxchnge_analytics.dart';
 
 import 'package:sxchnge_auth/sxchnge_auth.dart';
 
+import 'package:sxchnge_kyc/sxchnge_kyc.dart';
+
+import 'package:sxchnge_wallet/sxchnge_wallet.dart';
+
 import 'package:sxchnge_app/main.dart';
 import 'package:sxchnge_app/providers/locale.dart';
 
+import 'destination_helpers.dart';
+
 Future<void> tapFactor(WidgetTester t, String key) async {
   final finder = find.byKey(ValueKey(key));
   await t.ensureVisible(finder);
@@ -31,8 +37,16 @@ Future<DummyTwoFactorService> openFactor(
     delay: Duration.zero,
     method: method,
   );
+  final wallet = DummyWalletService(
+    DummyIdentityService(delay: Duration.zero),
+    factors: service,
+    initialLocale: locale,
+    delay: Duration.zero,
+  );
+  await seedDestination(wallet.destinations);
   await t.pumpWidget(
     SxchngeApp(
+      walletService: wallet,
       twoFactorService: service,
       analyticsService: analytics,
       localeProvider: LocaleProvider(initialLocale: Locale(locale)),
@@ -174,10 +188,7 @@ void main() {
         await openFactor(t, path: '/$kind', enabled: true);
         await t.enterText(find.byKey(const ValueKey('transfer-amount')), '10');
         if (kind == 'payout') {
-          await t.enterText(
-            find.byKey(const ValueKey('transfer-recipient')),
-            'Sample recipient',
-          );
+          await selectPayout(t);
         }
         await tapFactor(t, 'transfer-review');
         await tapFactor(t, 'transfer-confirm');