samples/provider_shopper/test/widget_test.dart

// Copyright 2019 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_shopper/main.dart';

void main() {
  testWidgets('smoke test', (tester) async {
    // Build our app and trigger a frame.
    await tester.pumpWidget(MyApp());

    // Navigating through login page.
    await tester.tap(find.text('ENTER'));
    await tester.pumpAndSettle();

    // Check that shopping cart is empty at start.
    await tester.tap(find.byIcon(Icons.shopping_cart));
    await tester.pumpAndSettle();
    expect(find.text('\$0'), findsOneWidget);

    // Buy an item.
    await tester.pageBack();
    await tester.pumpAndSettle();
    await tester.tap(find.text('ADD').first);

    // Check that the shopping cart is not empty anymore.
    await tester.tap(find.byIcon(Icons.shopping_cart));
    await tester.pumpAndSettle();
    expect(find.text('\$0'), findsNothing);
  });
}