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659 lines
23 KiB
Dart
659 lines
23 KiB
Dart
// Copyright 2014 The Flutter Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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import 'package:flutter/gestures.dart';
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import 'package:flutter/material.dart';
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import 'package:flutter_test/flutter_test.dart';
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void main() {
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group('text contrast guideline', () {
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testWidgets('black text on white background - Text Widget - direct style', (WidgetTester tester) async {
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final SemanticsHandle handle = tester.ensureSemantics();
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await tester.pumpWidget(_boilerplate(
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const Text(
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'this is a test',
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style: TextStyle(fontSize: 14.0, color: Colors.black),
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),
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));
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await expectLater(tester, meetsGuideline(textContrastGuideline));
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handle.dispose();
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});
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testWidgets('white text on black background - Text Widget - direct style', (WidgetTester tester) async {
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final SemanticsHandle handle = tester.ensureSemantics();
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await tester.pumpWidget(_boilerplate(
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Container(
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width: 200.0,
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height: 200.0,
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color: Colors.black,
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child: const Text(
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'this is a test',
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style: TextStyle(fontSize: 14.0, color: Colors.white),
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),
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),
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));
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await expectLater(tester, meetsGuideline(textContrastGuideline));
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handle.dispose();
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});
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testWidgets('black text on white background - Text Widget - inherited style', (WidgetTester tester) async {
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final SemanticsHandle handle = tester.ensureSemantics();
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await tester.pumpWidget(_boilerplate(
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DefaultTextStyle(
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style: const TextStyle(fontSize: 14.0, color: Colors.black),
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child: Container(
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color: Colors.white,
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child: const Text('this is a test'),
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),
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),
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));
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await expectLater(tester, meetsGuideline(textContrastGuideline));
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handle.dispose();
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});
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testWidgets('white text on black background - Text Widget - inherited style', (WidgetTester tester) async {
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final SemanticsHandle handle = tester.ensureSemantics();
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await tester.pumpWidget(_boilerplate(
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DefaultTextStyle(
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style: const TextStyle(fontSize: 14.0, color: Colors.white),
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child: Container(
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width: 200.0,
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height: 200.0,
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color: Colors.black,
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child: const Text('this is a test'),
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),
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),
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));
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await expectLater(tester, meetsGuideline(textContrastGuideline));
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handle.dispose();
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});
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testWidgets('Material text field - amber on amber', (WidgetTester tester) async {
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final SemanticsHandle handle = tester.ensureSemantics();
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await tester.pumpWidget(MaterialApp(
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home: Scaffold(
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body: Container(
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width: 200.0,
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height: 200.0,
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color: Colors.amberAccent,
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child: TextField(
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style: const TextStyle(color: Colors.amber),
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controller: TextEditingController(text: 'this is a test'),
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),
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),
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),
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));
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await expectLater(tester, doesNotMeetGuideline(textContrastGuideline));
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handle.dispose();
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});
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testWidgets('Material text field - default style', (WidgetTester tester) async {
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final SemanticsHandle handle = tester.ensureSemantics();
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await tester.pumpWidget(MaterialApp(
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home: Scaffold(
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body: Center(
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child: SizedBox(
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width: 100,
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child: TextField(
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controller: TextEditingController(text: 'this is a test'),
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),
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),
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),
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),
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),
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);
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await tester.idle();
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await expectLater(tester, meetsGuideline(textContrastGuideline));
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handle.dispose();
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});
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testWidgets('yellow text on yellow background fails with correct message', (WidgetTester tester) async {
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final SemanticsHandle handle = tester.ensureSemantics();
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await tester.pumpWidget(_boilerplate(
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Container(
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width: 200.0,
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height: 200.0,
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color: Colors.yellow,
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child: const Text(
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'this is a test',
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style: TextStyle(fontSize: 14.0, color: Colors.yellowAccent),
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),
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),
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));
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final Evaluation result = await textContrastGuideline.evaluate(tester);
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expect(result.passed, false);
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expect(result.reason,
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'SemanticsNode#4(Rect.fromLTRB(300.0, 200.0, 500.0, 400.0), label: "this is a test",'
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' textDirection: ltr):\nExpected contrast ratio of at least '
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'4.5 but found 1.17 for a font size of 14.0. The '
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'computed light color was: Color(0xfffafafa), The computed dark color was:'
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' Color(0xffffeb3b)\n'
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'See also: https://www.w3.org/TR/UNDERSTANDING-WCAG20/visual-audio-contrast-contrast.html');
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handle.dispose();
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});
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testWidgets('label without corresponding text is skipped', (WidgetTester tester) async {
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final SemanticsHandle handle = tester.ensureSemantics();
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await tester.pumpWidget(_boilerplate(
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Semantics(
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label: 'This is not text',
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container: true,
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child: const SizedBox(
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width: 200.0,
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height: 200.0,
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child: Placeholder(),
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),
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),
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));
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final Evaluation result = await textContrastGuideline.evaluate(tester);
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expect(result.passed, true);
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handle.dispose();
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});
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testWidgets('offscreen text is skipped', (WidgetTester tester) async {
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final SemanticsHandle handle = tester.ensureSemantics();
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await tester.pumpWidget(_boilerplate(
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Stack(
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children: <Widget>[
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Positioned(
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left: -300.0,
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child: Container(
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width: 200.0,
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height: 200.0,
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color: Colors.yellow,
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child: const Text(
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'this is a test',
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style: TextStyle(fontSize: 14.0, color: Colors.yellowAccent),
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),
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),
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),
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],
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)
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));
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final Evaluation result = await textContrastGuideline.evaluate(tester);
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expect(result.passed, true);
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handle.dispose();
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});
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testWidgets('Disabled button is excluded from text contrast guideline', (WidgetTester tester) async {
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// Regression test https://github.com/flutter/flutter/issues/94428
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final SemanticsHandle handle = tester.ensureSemantics();
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await tester.pumpWidget(
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_boilerplate(
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ElevatedButton(
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onPressed: null,
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child: Container(
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width: 200.0,
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height: 200.0,
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color: Colors.yellow,
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child: const Text(
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'this is a test',
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style: TextStyle(fontSize: 14.0, color: Colors.yellowAccent),
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),
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),
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),
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)
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);
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await expectLater(tester, meetsGuideline(textContrastGuideline));
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handle.dispose();
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});
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});
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group('custom minimum contrast guideline', () {
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Widget _icon({IconData icon = Icons.search, required Color color, required Color background}) {
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return Container(
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padding: const EdgeInsets.all(8.0),
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color: background,
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child: Icon(icon, color: color),
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);
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}
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Widget _text({String text = 'Text', required Color color, required Color background}) {
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return Container(
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padding: const EdgeInsets.all(8.0),
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color: background,
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child: Text(text, style: TextStyle(color: color)),
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);
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}
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Widget _row(List<Widget> widgets) => _boilerplate(Row(children: widgets));
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final Finder findIcons = find.byWidgetPredicate((Widget widget) => widget is Icon);
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final Finder findTexts = find.byWidgetPredicate((Widget widget) => widget is Text);
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final Finder findIconsAndTexts = find.byWidgetPredicate((Widget widget) => widget is Icon || widget is Text);
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testWidgets('Black icons on white background', (WidgetTester tester) async {
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await tester.pumpWidget(_row(<Widget>[
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_icon(color: Colors.black, background: Colors.white),
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_icon(color: Colors.black, background: Colors.white),
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]));
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await expectLater(tester, meetsGuideline(CustomMinimumContrastGuideline(finder: findIcons)));
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});
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testWidgets('Black icons on black background', (WidgetTester tester) async {
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await tester.pumpWidget(_row(<Widget>[
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_icon(color: Colors.black, background: Colors.black),
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_icon(color: Colors.black, background: Colors.black),
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]));
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await expectLater(tester, doesNotMeetGuideline(CustomMinimumContrastGuideline(finder: findIcons)));
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});
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testWidgets('White icons on black background ("dark mode")', (WidgetTester tester) async {
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await tester.pumpWidget(_row(<Widget>[
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_icon(color: Colors.white, background: Colors.black),
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_icon(color: Colors.white, background: Colors.black),
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]));
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await expectLater(tester, meetsGuideline(CustomMinimumContrastGuideline(finder: findIcons)));
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});
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testWidgets('Using different icons', (WidgetTester tester) async {
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await tester.pumpWidget(_row(<Widget>[
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_icon(color: Colors.black, background: Colors.white, icon: Icons.more_horiz),
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_icon(color: Colors.black, background: Colors.white, icon: Icons.description),
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_icon(color: Colors.black, background: Colors.white, icon: Icons.image),
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_icon(color: Colors.black, background: Colors.white, icon: Icons.beach_access),
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]));
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await expectLater(tester, meetsGuideline(CustomMinimumContrastGuideline(finder: findIcons)));
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});
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testWidgets('One invalid instance fails entire test', (WidgetTester tester) async {
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await tester.pumpWidget(_row(<Widget>[
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_icon(color: Colors.black, background: Colors.white),
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_icon(color: Colors.black, background: Colors.black),
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]));
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await expectLater(tester, doesNotMeetGuideline(CustomMinimumContrastGuideline(finder: findIcons)));
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});
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testWidgets('White on different colors, passing', (WidgetTester tester) async {
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await tester.pumpWidget(_row(<Widget>[
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_icon(color: Colors.white, background: Colors.red[800]!, icon: Icons.more_horiz),
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_icon(color: Colors.white, background: Colors.green[800]!, icon: Icons.description),
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_icon(color: Colors.white, background: Colors.blue[800]!, icon: Icons.image),
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_icon(color: Colors.white, background: Colors.purple[800]!, icon: Icons.beach_access),
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]));
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await expectLater(tester, meetsGuideline(CustomMinimumContrastGuideline(finder: findIcons)));
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});
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testWidgets('White on different colors, failing', (WidgetTester tester) async {
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await tester.pumpWidget(_row(<Widget>[
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_icon(color: Colors.white, background: Colors.red[200]!, icon: Icons.more_horiz),
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_icon(color: Colors.white, background: Colors.green[400]!, icon: Icons.description),
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_icon(color: Colors.white, background: Colors.blue[600]!, icon: Icons.image),
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_icon(color: Colors.white, background: Colors.purple[800]!, icon: Icons.beach_access),
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]));
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await expectLater(tester, doesNotMeetGuideline(CustomMinimumContrastGuideline(finder: findIcons)));
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});
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testWidgets('Absence of icons, passing', (WidgetTester tester) async {
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await tester.pumpWidget(_row(<Widget>[]));
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await expectLater(tester, meetsGuideline(CustomMinimumContrastGuideline(finder: findIcons)));
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});
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testWidgets('Absence of icons, passing - 2nd test', (WidgetTester tester) async {
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await tester.pumpWidget(_row(<Widget>[
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_text(color: Colors.black, background: Colors.white),
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_text(color: Colors.black, background: Colors.black),
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]));
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await expectLater(tester, meetsGuideline(CustomMinimumContrastGuideline(finder: findIcons)));
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});
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testWidgets('Guideline ignores widgets of other types', (WidgetTester tester) async {
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await tester.pumpWidget(_row(<Widget>[
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_icon(color: Colors.black, background: Colors.white),
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_icon(color: Colors.black, background: Colors.white),
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_text(color: Colors.black, background: Colors.white),
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_text(color: Colors.black, background: Colors.black),
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]));
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await expectLater(tester, meetsGuideline(CustomMinimumContrastGuideline(finder: findIcons)));
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await expectLater(tester, doesNotMeetGuideline(CustomMinimumContrastGuideline(finder: findTexts)));
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await expectLater(tester, doesNotMeetGuideline(CustomMinimumContrastGuideline(finder: findIconsAndTexts)));
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});
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testWidgets('Custom minimum ratio - Icons', (WidgetTester tester) async {
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await tester.pumpWidget(_row(<Widget>[
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_icon(color: Colors.blue, background: Colors.white),
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_icon(color: Colors.black, background: Colors.white),
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]));
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await expectLater(tester, doesNotMeetGuideline(CustomMinimumContrastGuideline(finder: findIcons)));
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await expectLater(tester, meetsGuideline(CustomMinimumContrastGuideline(finder: findIcons, minimumRatio: 3.0)));
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});
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testWidgets('Custom minimum ratio - Texts', (WidgetTester tester) async {
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await tester.pumpWidget(_row(<Widget>[
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_text(color: Colors.blue, background: Colors.white),
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_text(color: Colors.black, background: Colors.white),
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]));
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await expectLater(tester, doesNotMeetGuideline(CustomMinimumContrastGuideline(finder: findTexts)));
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await expectLater(tester, meetsGuideline(CustomMinimumContrastGuideline(finder: findTexts, minimumRatio: 3.0)));
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});
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testWidgets('Custom minimum ratio - Different standards for icons and texts', (WidgetTester tester) async {
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await tester.pumpWidget(_row(<Widget>[
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_icon(color: Colors.blue, background: Colors.white),
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_icon(color: Colors.black, background: Colors.white),
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_text(color: Colors.blue, background: Colors.white),
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_text(color: Colors.black, background: Colors.white),
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]));
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await expectLater(tester, doesNotMeetGuideline(CustomMinimumContrastGuideline(finder: findIcons)));
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await expectLater(tester, meetsGuideline(CustomMinimumContrastGuideline(finder: findTexts, minimumRatio: 3.0)));
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});
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});
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group('tap target size guideline', () {
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testWidgets('Tappable box at 48 by 48', (WidgetTester tester) async {
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final SemanticsHandle handle = tester.ensureSemantics();
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await tester.pumpWidget(_boilerplate(
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SizedBox(
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width: 48.0,
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height: 48.0,
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child: GestureDetector(
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onTap: () { },
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),
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),
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));
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await expectLater(tester, meetsGuideline(androidTapTargetGuideline));
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handle.dispose();
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});
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testWidgets('Tappable box at 47 by 48', (WidgetTester tester) async {
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final SemanticsHandle handle = tester.ensureSemantics();
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await tester.pumpWidget(_boilerplate(
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SizedBox(
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width: 47.0,
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height: 48.0,
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child: GestureDetector(
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onTap: () { },
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),
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),
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));
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await expectLater(tester, doesNotMeetGuideline(androidTapTargetGuideline));
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handle.dispose();
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});
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testWidgets('Tappable box at 48 by 47', (WidgetTester tester) async {
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final SemanticsHandle handle = tester.ensureSemantics();
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await tester.pumpWidget(_boilerplate(
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SizedBox(
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width: 48.0,
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height: 47.0,
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child: GestureDetector(
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onTap: () { },
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),
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),
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));
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await expectLater(tester, doesNotMeetGuideline(androidTapTargetGuideline));
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handle.dispose();
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});
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testWidgets('Tappable box at 48 by 48 shrunk by transform', (WidgetTester tester) async {
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final SemanticsHandle handle = tester.ensureSemantics();
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await tester.pumpWidget(_boilerplate(
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Transform.scale(
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scale: 0.5, // should have new height of 24 by 24.
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child: SizedBox(
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width: 48.0,
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height: 48.0,
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child: GestureDetector(
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onTap: () { },
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),
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),
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),
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));
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await expectLater(tester, doesNotMeetGuideline(androidTapTargetGuideline));
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handle.dispose();
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});
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testWidgets('Too small tap target fails with the correct message', (WidgetTester tester) async {
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final SemanticsHandle handle = tester.ensureSemantics();
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await tester.pumpWidget(_boilerplate(
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SizedBox(
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width: 48.0,
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height: 47.0,
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child: GestureDetector(
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onTap: () { },
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),
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),
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));
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final Evaluation result = await androidTapTargetGuideline.evaluate(tester);
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expect(result.passed, false);
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expect(result.reason,
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'SemanticsNode#4(Rect.fromLTRB(376.0, 276.5, 424.0, 323.5), actions: [tap]): expected tap '
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'target size of at least Size(48.0, 48.0), but found Size(48.0, 47.0)\n'
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'See also: https://support.google.com/accessibility/android/answer/7101858?hl=en');
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handle.dispose();
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});
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testWidgets('Box that overlaps edge of window is skipped', (WidgetTester tester) async {
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final SemanticsHandle handle = tester.ensureSemantics();
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final Widget smallBox = SizedBox(
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width: 48.0,
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height: 47.0,
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child: GestureDetector(
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onTap: () { },
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),
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);
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await tester.pumpWidget(
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MaterialApp(
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home: Stack(
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children: <Widget>[
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Positioned(
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left: 0.0,
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top: -1.0,
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child: smallBox,
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),
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],
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),
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),
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);
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final Evaluation overlappingTopResult = await androidTapTargetGuideline.evaluate(tester);
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expect(overlappingTopResult.passed, true);
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await tester.pumpWidget(
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MaterialApp(
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home: Stack(
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children: <Widget>[
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Positioned(
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left: -1.0,
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top: 0.0,
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child: smallBox,
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),
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],
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),
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),
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);
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final Evaluation overlappingLeftResult = await androidTapTargetGuideline.evaluate(tester);
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expect(overlappingLeftResult.passed, true);
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await tester.pumpWidget(
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MaterialApp(
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home: Stack(
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children: <Widget>[
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Positioned(
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|
bottom: -1.0,
|
|
child: smallBox,
|
|
),
|
|
],
|
|
),
|
|
),
|
|
);
|
|
|
|
final Evaluation overlappingBottomResult = await androidTapTargetGuideline.evaluate(tester);
|
|
expect(overlappingBottomResult.passed, true);
|
|
|
|
await tester.pumpWidget(
|
|
MaterialApp(
|
|
home: Stack(
|
|
children: <Widget>[
|
|
Positioned(
|
|
right: -1.0,
|
|
child: smallBox,
|
|
),
|
|
],
|
|
),
|
|
),
|
|
);
|
|
|
|
final Evaluation overlappingRightResult = await androidTapTargetGuideline.evaluate(tester);
|
|
expect(overlappingRightResult.passed, true);
|
|
handle.dispose();
|
|
});
|
|
|
|
testWidgets('Does not fail on mergedIntoParent child', (WidgetTester tester) async {
|
|
final SemanticsHandle handle = tester.ensureSemantics();
|
|
await tester.pumpWidget(_boilerplate(
|
|
MergeSemantics(
|
|
child: Semantics(
|
|
container: true,
|
|
child: SizedBox(
|
|
width: 50.0,
|
|
height: 50.0,
|
|
child: Semantics(
|
|
container: true,
|
|
child: GestureDetector(
|
|
onTap: () { },
|
|
child: const SizedBox(width: 4.0, height: 4.0),
|
|
),
|
|
),
|
|
),
|
|
),
|
|
)
|
|
));
|
|
|
|
final Evaluation overlappingRightResult = await androidTapTargetGuideline.evaluate(tester);
|
|
expect(overlappingRightResult.passed, true);
|
|
handle.dispose();
|
|
});
|
|
|
|
testWidgets('Does not fail on links', (WidgetTester tester) async {
|
|
Widget textWithLink() {
|
|
return Builder(
|
|
builder: (BuildContext context) {
|
|
return RichText(
|
|
text: TextSpan(
|
|
children: <InlineSpan>[
|
|
const TextSpan(
|
|
text: 'See examples at ',
|
|
),
|
|
TextSpan(
|
|
text: 'flutter repo',
|
|
recognizer: TapGestureRecognizer()
|
|
..onTap = () { },
|
|
),
|
|
],
|
|
),
|
|
);
|
|
},
|
|
);
|
|
}
|
|
|
|
final SemanticsHandle handle = tester.ensureSemantics();
|
|
await tester.pumpWidget(_boilerplate(textWithLink()));
|
|
|
|
await expectLater(tester, meetsGuideline(androidTapTargetGuideline));
|
|
handle.dispose();
|
|
});
|
|
});
|
|
|
|
group('Labeled tappable node guideline', () {
|
|
testWidgets('Passes when node is labeled', (WidgetTester tester) async {
|
|
final SemanticsHandle handle = tester.ensureSemantics();
|
|
await tester.pumpWidget(_boilerplate(Semantics(
|
|
container: true,
|
|
onTap: () { },
|
|
label: 'test',
|
|
child: const SizedBox(width: 10.0, height: 10.0),
|
|
)));
|
|
final Evaluation result = await labeledTapTargetGuideline.evaluate(tester);
|
|
expect(result.passed, true);
|
|
handle.dispose();
|
|
});
|
|
testWidgets('Fails if long-press has no label', (WidgetTester tester) async {
|
|
final SemanticsHandle handle = tester.ensureSemantics();
|
|
await tester.pumpWidget(_boilerplate(Semantics(
|
|
container: true,
|
|
onLongPress: () { },
|
|
label: '',
|
|
child: const SizedBox(width: 10.0, height: 10.0),
|
|
)));
|
|
final Evaluation result = await labeledTapTargetGuideline.evaluate(tester);
|
|
expect(result.passed, false);
|
|
handle.dispose();
|
|
});
|
|
|
|
testWidgets('Fails if tap has no label', (WidgetTester tester) async {
|
|
final SemanticsHandle handle = tester.ensureSemantics();
|
|
await tester.pumpWidget(_boilerplate(Semantics(
|
|
container: true,
|
|
onTap: () { },
|
|
label: '',
|
|
child: const SizedBox(width: 10.0, height: 10.0),
|
|
)));
|
|
final Evaluation result = await labeledTapTargetGuideline.evaluate(tester);
|
|
expect(result.passed, false);
|
|
handle.dispose();
|
|
});
|
|
|
|
testWidgets('Passes if tap is merged into labeled node', (WidgetTester tester) async {
|
|
final SemanticsHandle handle = tester.ensureSemantics();
|
|
await tester.pumpWidget(_boilerplate(Semantics(
|
|
container: true,
|
|
onLongPress: () { },
|
|
label: '',
|
|
child: Semantics(
|
|
label: 'test',
|
|
child: const SizedBox(width: 10.0, height: 10.0),
|
|
),
|
|
)));
|
|
final Evaluation result = await labeledTapTargetGuideline.evaluate(tester);
|
|
expect(result.passed, true);
|
|
handle.dispose();
|
|
});
|
|
});
|
|
|
|
testWidgets('regression test for material widget', (WidgetTester tester) async {
|
|
final SemanticsHandle handle = tester.ensureSemantics();
|
|
await tester.pumpWidget(
|
|
MaterialApp(
|
|
theme: ThemeData.light(),
|
|
home: Scaffold(
|
|
backgroundColor: Colors.white,
|
|
body: ElevatedButton(
|
|
style: ElevatedButton.styleFrom(
|
|
primary: const Color(0xFFFBBC04),
|
|
elevation: 0,
|
|
),
|
|
onPressed: () {},
|
|
child: const Text('Button', style: TextStyle(color: Colors.black)),
|
|
),
|
|
),
|
|
));
|
|
await expectLater(tester, meetsGuideline(textContrastGuideline));
|
|
handle.dispose();
|
|
});
|
|
}
|
|
|
|
Widget _boilerplate(Widget child) {
|
|
return MaterialApp(
|
|
home: Scaffold(body: Center(child: child)),
|
|
);
|
|
}
|