examples/api/test/widgets/animated_list/sliver_animated_list.0_test.dart

// Copyright 2014 The Flutter Authors. 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_api_samples/widgets/animated_list/sliver_animated_list.0.dart' as example;
import 'package:flutter_test/flutter_test.dart';

void main() {
  testWidgets(
    'Items can be selected, added, and removed from SliverAnimatedList',
    (WidgetTester tester) async {
      await tester.pumpWidget(const example.SliverAnimatedListSample());

      expect(find.text('Item 0'), findsOneWidget);
      expect(find.text('Item 1'), findsOneWidget);
      expect(find.text('Item 2'), findsOneWidget);

      // Add an item at the end of the list
      await tester.tap(find.byIcon(Icons.add_circle));
      await tester.pumpAndSettle();
      expect(find.text('Item 3'), findsOneWidget);

      // Select Item 1.
      await tester.tap(find.text('Item 1'));
      await tester.pumpAndSettle();

      // Add item at the top of the list
      await tester.tap(find.byIcon(Icons.add_circle));
      await tester.pumpAndSettle();
      expect(find.text('Item 4'), findsOneWidget);

      // Remove selected item.
      await tester.tap(find.byIcon(Icons.remove_circle));

      // Item animation is not completed.
      await tester.pump();
      expect(find.text('Item 1'), findsOneWidget);

      // When the animation completes, Item 1 disappears.
      await tester.pumpAndSettle();
      expect(find.text('Item 1'), findsNothing);
    },
  );
}