packages/flutter/test/widgets/semantics_merge_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() {
  setUp(() {
    debugResetSemanticsIdCounter();
  });

  testWidgets('MergeSemantics', (WidgetTester tester) async {
    final SemanticsTester semantics = SemanticsTester(tester);

    // not merged
    await tester.pumpWidget(
      Directionality(
        textDirection: TextDirection.ltr,
        child: Row(
          children: <Widget>[
            Semantics(container: true, child: const Text('test1')),
            Semantics(container: true, child: const Text('test2')),
          ],
        ),
      ),
    );

    expect(
      semantics,
      hasSemantics(
        TestSemantics.root(
          children: <TestSemantics>[
            TestSemantics.rootChild(id: 1, label: 'test1'),
            TestSemantics.rootChild(id: 2, label: 'test2'),
          ],
        ),
        ignoreRect: true,
        ignoreTransform: true,
      ),
    );

    // merged
    await tester.pumpWidget(
      Directionality(
        textDirection: TextDirection.ltr,
        child: MergeSemantics(
          child: Row(
            children: <Widget>[
              Semantics(container: true, child: const Text('test1')),
              Semantics(container: true, child: const Text('test2')),
            ],
          ),
        ),
      ),
    );

    expect(
      semantics,
      hasSemantics(
        TestSemantics.root(
          children: <TestSemantics>[TestSemantics.rootChild(id: 3, label: 'test1\ntest2')],
        ),
        ignoreRect: true,
        ignoreTransform: true,
      ),
    );

    // not merged
    await tester.pumpWidget(
      Directionality(
        textDirection: TextDirection.ltr,
        child: Row(
          children: <Widget>[
            Semantics(container: true, child: const Text('test1')),
            Semantics(container: true, child: const Text('test2')),
          ],
        ),
      ),
    );

    expect(
      semantics,
      hasSemantics(
        TestSemantics.root(
          children: <TestSemantics>[
            TestSemantics.rootChild(id: 6, label: 'test1'),
            TestSemantics.rootChild(id: 7, label: 'test2'),
          ],
        ),
        ignoreRect: true,
        ignoreTransform: true,
      ),
    );

    semantics.dispose();
  });

  testWidgets('MergeSemantics works if other nodes are implicitly merged into its node', (
    WidgetTester tester,
  ) async {
    final SemanticsTester semantics = SemanticsTester(tester);

    await tester.pumpWidget(
      Directionality(
        textDirection: TextDirection.ltr,
        child: MergeSemantics(
          child: Semantics(
            selected: true, // this is implicitly merged into the MergeSemantics node
            child: Row(
              children: <Widget>[
                Semantics(container: true, child: const Text('test1')),
                Semantics(container: true, child: const Text('test2')),
              ],
            ),
          ),
        ),
      ),
    );

    expect(
      semantics,
      hasSemantics(
        TestSemantics.root(
          children: <TestSemantics>[
            TestSemantics.rootChild(
              id: 1,
              flags: <SemanticsFlag>[SemanticsFlag.hasSelectedState, SemanticsFlag.isSelected],
              label: 'test1\ntest2',
            ),
          ],
        ),
        ignoreRect: true,
        ignoreTransform: true,
      ),
    );

    semantics.dispose();
  });
}