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samples/provider_shopper/test/cart_widget_test.dart

63 lines
2.0 KiB

// Copyright 2020 The Flutter team. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
import 'package:flutter/material.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:provider/provider.dart';
import 'package:provider_shopper/models/cart.dart';
import 'package:provider_shopper/models/catalog.dart';
import 'package:provider_shopper/screens/cart.dart';
CartModel? cartModel;
CatalogModel? catalogModel;
Widget createCartScreen() => MultiProvider(
providers: [
Provider(create: (context) => CatalogModel()),
ChangeNotifierProxyProvider<CatalogModel, CartModel>(
create: (context) => CartModel(),
update: (context, catalog, cart) {
catalogModel = catalog;
cartModel = cart;
cart!.catalog = catalogModel!;
return cart;
},
),
],
child: MaterialApp(
home: MyCart(),
),
);
void main() {
group('CartScreen widget tests', () {
testWidgets('Tapping BUY button displays snackbar.', (tester) async {
await tester.pumpWidget(createCartScreen());
// Verify no snackbar initially exists.
expect(find.byType(SnackBar), findsNothing);
await tester.tap(find.text('BUY'));
// Schedule animation.
await tester.pump();
// Verifying the snackbar upon clicking the button.
expect(find.byType(SnackBar), findsOneWidget);
});
testWidgets('Testing when the cart contains items', (tester) async {
await tester.pumpWidget(createCartScreen());
// Adding five items in the cart and testing.
for (var i = 0; i < 5; i++) {
var item = catalogModel!.getByPosition(i);
cartModel!.add(item);
await tester.pumpAndSettle();
expect(find.text(item.name), findsOneWidget);
}
// Testing total price of the five items.
expect(find.text('\$${42 * 5}'), findsOneWidget);
expect(find.byIcon(Icons.done), findsNWidgets(5));
});
});
}