packages/flutter/test/widgets/semantics_11_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/rendering.dart';
import 'package:flutter/widgets.dart';
import 'package:flutter_test/flutter_test.dart';

import 'semantics_tester.dart';

void main() {
  testWidgets('markNeedsSemanticsUpdate() called on non-boundary with non-boundary parent', (
    WidgetTester tester,
  ) async {
    final SemanticsTester semantics = SemanticsTester(tester);

    await tester.pumpWidget(
      Semantics(
        container: true,
        onTap: dummyTapHandler,
        child: Semantics(
          onTap: dummyTapHandler,
          child: Semantics(onTap: dummyTapHandler, textDirection: TextDirection.ltr, label: 'foo'),
        ),
      ),
    );

    expect(
      semantics,
      hasSemantics(
        TestSemantics.root(
          children: <TestSemantics>[
            TestSemantics.rootChild(
              id: 1,
              actions: SemanticsAction.tap.index,
              children: <TestSemantics>[
                TestSemantics(
                  id: 2,
                  actions: SemanticsAction.tap.index,
                  children: <TestSemantics>[
                    TestSemantics(id: 3, actions: SemanticsAction.tap.index, label: 'foo'),
                  ],
                ),
              ],
            ),
          ],
        ),
        ignoreRect: true,
        ignoreTransform: true,
      ),
    );

    // make a change causing call to markNeedsSemanticsUpdate()

    // This should not throw an assert.
    await tester.pumpWidget(
      Semantics(
        container: true,
        onTap: dummyTapHandler,
        child: Semantics(
          onTap: dummyTapHandler,
          child: Semantics(
            onTap: dummyTapHandler,
            textDirection: TextDirection.ltr,
            label: 'bar', // <-- only change
          ),
        ),
      ),
    );

    expect(
      semantics,
      hasSemantics(
        TestSemantics.root(
          children: <TestSemantics>[
            TestSemantics.rootChild(
              id: 1,
              actions: SemanticsAction.tap.index,
              children: <TestSemantics>[
                TestSemantics(
                  id: 2,
                  actions: SemanticsAction.tap.index,
                  children: <TestSemantics>[
                    TestSemantics(id: 3, actions: SemanticsAction.tap.index, label: 'bar'),
                  ],
                ),
              ],
            ),
          ],
        ),
        ignoreRect: true,
        ignoreTransform: true,
      ),
    );

    semantics.dispose();
  });
}

void dummyTapHandler() {}