flutter_flutter/packages/flutter/test/widgets/implicit_semantics_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/widgets.dart';
import 'package:flutter_test/flutter_test.dart';

import 'semantics_tester.dart';

void main() {
  testWidgets('Implicit Semantics merge behavior', (WidgetTester tester) async {
    final semantics = SemanticsTester(tester);

    await tester.pumpWidget(
      Directionality(
        textDirection: TextDirection.ltr,
        child: Semantics(
          container: true,
          child: const Column(
            children: <Widget>[Text('Michael Goderbauer'), Text('goderbauer@google.com')],
          ),
        ),
      ),
    );

    // SemanticsNode#0()
    //  └SemanticsNode#1(label: "Michael Goderbauer\ngoderbauer@google.com", textDirection: ltr)
    expect(
      semantics,
      hasSemantics(
        TestSemantics.root(
          children: <TestSemantics>[
            TestSemantics.rootChild(id: 1, label: 'Michael Goderbauer\ngoderbauer@google.com'),
          ],
        ),
        ignoreRect: true,
        ignoreTransform: true,
      ),
    );

    await tester.pumpWidget(
      Directionality(
        textDirection: TextDirection.ltr,
        child: Semantics(
          container: true,
          explicitChildNodes: true,
          child: const Column(
            children: <Widget>[Text('Michael Goderbauer'), Text('goderbauer@google.com')],
          ),
        ),
      ),
    );

    // SemanticsNode#0()
    //  └SemanticsNode#1()
    //    ├SemanticsNode#2(label: "Michael Goderbauer", textDirection: ltr)
    //    └SemanticsNode#3(label: "goderbauer@google.com", textDirection: ltr)
    expect(
      semantics,
      hasSemantics(
        TestSemantics.root(
          children: <TestSemantics>[
            TestSemantics.rootChild(
              id: 1,
              children: <TestSemantics>[
                TestSemantics(id: 2, label: 'Michael Goderbauer'),
                TestSemantics(id: 3, label: 'goderbauer@google.com'),
              ],
            ),
          ],
        ),
        ignoreRect: true,
        ignoreTransform: true,
      ),
    );

    await tester.pumpWidget(
      Directionality(
        textDirection: TextDirection.ltr,
        child: Semantics(
          container: true,
          explicitChildNodes: true,
          child: Semantics(
            label: 'Signed in as',
            child: const Column(
              children: <Widget>[Text('Michael Goderbauer'), Text('goderbauer@google.com')],
            ),
          ),
        ),
      ),
    );

    // SemanticsNode#0()
    //  └SemanticsNode#1()
    //    └SemanticsNode#4(label: "Signed in as\nMichael Goderbauer\ngoderbauer@google.com", textDirection: ltr)
    expect(
      semantics,
      hasSemantics(
        TestSemantics.root(
          children: <TestSemantics>[
            TestSemantics.rootChild(
              id: 1,
              children: <TestSemantics>[
                TestSemantics(
                  id: 4,
                  label: 'Signed in as\nMichael Goderbauer\ngoderbauer@google.com',
                ),
              ],
            ),
          ],
        ),
        ignoreRect: true,
        ignoreTransform: true,
      ),
    );

    await tester.pumpWidget(
      Directionality(
        textDirection: TextDirection.ltr,
        child: Semantics(
          container: true,
          child: Semantics(
            label: 'Signed in as',
            child: const Column(
              children: <Widget>[Text('Michael Goderbauer'), Text('goderbauer@google.com')],
            ),
          ),
        ),
      ),
    );

    // SemanticsNode#0()
    //  └SemanticsNode#1(label: "Signed in as\nMichael Goderbauer\ngoderbauer@google.com", textDirection: ltr)
    expect(
      semantics,
      hasSemantics(
        TestSemantics.root(
          children: <TestSemantics>[
            TestSemantics.rootChild(
              id: 1,
              label: 'Signed in as\nMichael Goderbauer\ngoderbauer@google.com',
            ),
          ],
        ),
        ignoreRect: true,
        ignoreTransform: true,
      ),
    );

    semantics.dispose();
  });

  testWidgets('Do not merge with conflicts', (WidgetTester tester) async {
    final semantics = SemanticsTester(tester);

    await tester.pumpWidget(
      Directionality(
        textDirection: TextDirection.ltr,
        child: Semantics(
          container: true,
          child: Column(
            children: <Widget>[
              Semantics(
                label: 'node 1',
                selected: true,
                child: const SizedBox(width: 10.0, height: 10.0),
              ),
              Semantics(
                label: 'node 2',
                selected: true,
                child: const SizedBox(width: 10.0, height: 10.0),
              ),
              Semantics(
                label: 'node 3',
                selected: true,
                child: const SizedBox(width: 10.0, height: 10.0),
              ),
            ],
          ),
        ),
      ),
    );

    // SemanticsNode#0()
    //  └SemanticsNode#1()
    //   ├SemanticsNode#2(selected, label: "node 1", textDirection: ltr)
    //   ├SemanticsNode#3(selected, label: "node 2", textDirection: ltr)
    //   └SemanticsNode#4(selected, label: "node 3", textDirection: ltr)
    expect(
      semantics,
      hasSemantics(
        TestSemantics.root(
          children: <TestSemantics>[
            TestSemantics.rootChild(
              id: 1,
              children: <TestSemantics>[
                TestSemantics(
                  id: 2,
                  flags: <SemanticsFlag>[SemanticsFlag.hasSelectedState, SemanticsFlag.isSelected],
                  label: 'node 1',
                ),
                TestSemantics(
                  id: 3,
                  flags: <SemanticsFlag>[SemanticsFlag.hasSelectedState, SemanticsFlag.isSelected],
                  label: 'node 2',
                ),
                TestSemantics(
                  id: 4,
                  flags: <SemanticsFlag>[SemanticsFlag.hasSelectedState, SemanticsFlag.isSelected],
                  label: 'node 3',
                ),
              ],
            ),
          ],
        ),
        ignoreRect: true,
        ignoreTransform: true,
      ),
    );

    semantics.dispose();
  });
}