packages/flutter/test/widgets/box_sliver_mismatch_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/rendering.dart';
import 'package:flutter/widgets.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:leak_tracker_flutter_testing/leak_tracker_flutter_testing.dart';

void main() {
  testWidgets(
    'Sliver in a box',
    experimentalLeakTesting:
        LeakTesting.settings.withIgnoredAll(), // leaking by design because of exception
    (WidgetTester tester) async {
      await tester.pumpWidget(
        DecoratedBox(
          decoration: const BoxDecoration(),
          child: SliverList(delegate: SliverChildListDelegate(const <Widget>[])),
        ),
      );

      expect(tester.takeException(), isFlutterError);

      await tester.pumpWidget(
        Row(children: <Widget>[SliverList(delegate: SliverChildListDelegate(const <Widget>[]))]),
      );

      expect(tester.takeException(), isFlutterError);
    },
  );

  testWidgets(
    'Box in a sliver',
    experimentalLeakTesting:
        LeakTesting.settings.withIgnoredAll(), // leaking by design because of exception
    (WidgetTester tester) async {
      late ViewportOffset offset1;
      addTearDown(() => offset1.dispose());
      await tester.pumpWidget(
        Viewport(
          crossAxisDirection: AxisDirection.right,
          offset: offset1 = ViewportOffset.zero(),
          slivers: const <Widget>[SizedBox()],
        ),
      );

      expect(tester.takeException(), isFlutterError);

      late ViewportOffset offset2;
      addTearDown(() => offset2.dispose());
      await tester.pumpWidget(
        Viewport(
          crossAxisDirection: AxisDirection.right,
          offset: offset2 = ViewportOffset.zero(),
          slivers: const <Widget>[SliverPadding(padding: EdgeInsets.zero, sliver: SizedBox())],
        ),
      );

      expect(tester.takeException(), isFlutterError);
    },
  );
}