flutter/examples/api/test/widgets/dismissible/dismissible.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/dismissible/dismissible.0.dart'
    as example;
import 'package:flutter_test/flutter_test.dart';

void main() {
  Future<void> dismissHorizontally({
    required WidgetTester tester,
    required Finder finder,
    required AxisDirection direction,
  }) async {
    final double width = (tester.renderObject(finder) as RenderBox).size.width;
    final double dx = width * 0.8;

    final Offset offset = switch (direction) {
      AxisDirection.left => Offset(-dx, 0.0),
      AxisDirection.right => Offset(dx, 0.0),
      _ => throw ArgumentError('$direction is not supported'),
    };

    await tester.drag(finder, offset);
  }

  testWidgets(
    'ListTiles can be dismissed from right to left',
    (WidgetTester tester) async {
      await tester.pumpWidget(
        const example.DismissibleExampleApp(),
      );

      for (final int index in <int>[0, 33, 66, 99]) {
        final ValueKey<int> key = ValueKey<int>(index);

        await tester.scrollUntilVisible(find.byKey(key), 100);

        expect(find.byKey(key), findsOneWidget);

        await dismissHorizontally(
          tester: tester,
          finder: find.byKey(key),
          direction: AxisDirection.left,
        );

        await tester.pumpAndSettle();

        expect(find.byKey(key), findsNothing);
      }
    },
  );

  testWidgets(
    'ListTiles can be dismissed from left to right',
    (WidgetTester tester) async {
      await tester.pumpWidget(
        const example.DismissibleExampleApp(),
      );

      for (final int index in <int>[0, 33, 66, 99]) {
        final ValueKey<int> key = ValueKey<int>(index);

        await tester.scrollUntilVisible(find.byKey(key), 100);

        expect(find.byKey(key), findsOneWidget);

        await dismissHorizontally(
          tester: tester,
          finder: find.byKey(key),
          direction: AxisDirection.right,
        );

        await tester.pumpAndSettle();

        expect(find.byKey(key), findsNothing);
      }
    },
  );
}