text_semantics_test.dart 4.72 KB
Newer Older
1 2 3 4 5 6
// 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/gestures.dart';
import 'package:flutter/material.dart';
7 8
import 'package:flutter/rendering.dart';
import 'package:flutter_test/flutter_test.dart';
9
import 'package:leak_tracker_flutter_testing/leak_tracker_flutter_testing.dart';
10 11 12 13

import 'semantics_tester.dart';

void main() {
14
  testWidgetsWithLeakTracking('SemanticsNode ids are stable', (WidgetTester tester) async {
15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134
    // Regression test for b/151732341.
    final SemanticsTester semantics = SemanticsTester(tester);
    await tester.pumpWidget(Directionality(
    textDirection: TextDirection.ltr,
      child: Text.rich(
        TextSpan(
          text: 'Hallo ',
          recognizer: TapGestureRecognizer()..onTap = () {},
          children: <TextSpan>[
            TextSpan(
              text: 'Welt ',
              recognizer: TapGestureRecognizer()..onTap = () {},
            ),
            TextSpan(
              text: '!!!',
              recognizer: TapGestureRecognizer()..onTap = () {},
            ),
          ],
        ),
      ),
    ));
    expect(find.text('Hallo Welt !!!'), findsOneWidget);
    final SemanticsNode node = tester.getSemantics(find.text('Hallo Welt !!!'));
    final Map<String, int> labelToNodeId = <String, int>{};
    node.visitChildren((SemanticsNode node) {
      labelToNodeId[node.label] = node.id;
       return true;
    });
    expect(node.id, 1);
    expect(labelToNodeId['Hallo '], 2);
    expect(labelToNodeId['Welt '], 3);
    expect(labelToNodeId['!!!'], 4);
    expect(labelToNodeId.length, 3);

    // Rebuild semantics.
    tester.renderObject(find.text('Hallo Welt !!!')).markNeedsSemanticsUpdate();
    await tester.pump();

    final SemanticsNode nodeAfterRebuild = tester.getSemantics(find.text('Hallo Welt !!!'));
    final Map<String, int> labelToNodeIdAfterRebuild = <String, int>{};
    nodeAfterRebuild.visitChildren((SemanticsNode node) {
      labelToNodeIdAfterRebuild[node.label] = node.id;
      return true;
    });

    // Node IDs are stable.
    expect(nodeAfterRebuild.id, node.id);
    expect(labelToNodeIdAfterRebuild['Hallo '], labelToNodeId['Hallo ']);
    expect(labelToNodeIdAfterRebuild['Welt '], labelToNodeId['Welt ']);
    expect(labelToNodeIdAfterRebuild['!!!'], labelToNodeId['!!!']);
    expect(labelToNodeIdAfterRebuild.length, 3);

    // Remove one node.
    await tester.pumpWidget(Directionality(
      textDirection: TextDirection.ltr,
      child: Text.rich(
        TextSpan(
          text: 'Hallo ',
          recognizer: TapGestureRecognizer()..onTap = () {},
          children: <TextSpan>[
            TextSpan(
              text: 'Welt ',
              recognizer: TapGestureRecognizer()..onTap = () {},
            ),
          ],
        ),
      ),
    ));

    final SemanticsNode nodeAfterRemoval = tester.getSemantics(find.text('Hallo Welt '));
    final Map<String, int> labelToNodeIdAfterRemoval = <String, int>{};
    nodeAfterRemoval.visitChildren((SemanticsNode node) {
      labelToNodeIdAfterRemoval[node.label] = node.id;
      return true;
    });

    // Node IDs are stable.
    expect(nodeAfterRemoval.id, node.id);
    expect(labelToNodeIdAfterRemoval['Hallo '], labelToNodeId['Hallo ']);
    expect(labelToNodeIdAfterRemoval['Welt '], labelToNodeId['Welt ']);
    expect(labelToNodeIdAfterRemoval.length, 2);

    await tester.pumpWidget(Directionality(
      textDirection: TextDirection.ltr,
      child: Text.rich(
        TextSpan(
          text: 'Hallo ',
          recognizer: TapGestureRecognizer()..onTap = () {},
          children: <TextSpan>[
            TextSpan(
              text: 'Welt ',
              recognizer: TapGestureRecognizer()..onTap = () {},
            ),
            TextSpan(
              text: '!!!',
              recognizer: TapGestureRecognizer()..onTap = () {},
            ),
          ],
        ),
      ),
    ));
    expect(find.text('Hallo Welt !!!'), findsOneWidget);
    final SemanticsNode nodeAfterAddition = tester.getSemantics(find.text('Hallo Welt !!!'));
    final Map<String, int> labelToNodeIdAfterAddition = <String, int>{};
    nodeAfterAddition.visitChildren((SemanticsNode node) {
      labelToNodeIdAfterAddition[node.label] = node.id;
      return true;
    });

    // New node gets a new ID.
    expect(nodeAfterAddition.id, node.id);
    expect(labelToNodeIdAfterAddition['Hallo '], labelToNodeId['Hallo ']);
    expect(labelToNodeIdAfterAddition['Welt '], labelToNodeId['Welt ']);
    expect(labelToNodeIdAfterAddition['!!!'], isNot(labelToNodeId['!!!']));
    expect(labelToNodeIdAfterAddition['!!!'], isNotNull);
    expect(labelToNodeIdAfterAddition.length, 3);

    semantics.dispose();
  });
}