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223 lines
7.7 KiB
Dart
223 lines
7.7 KiB
Dart
// Copyright 2018 The Chromium 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/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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new 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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new DefaultTextStyle(
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style: const TextStyle(fontSize: 14.0, color: Colors.black),
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child: new 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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new DefaultTextStyle(
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style: const TextStyle(fontSize: 14.0, color: Colors.white),
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child: new 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(new MaterialApp(
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home: new Scaffold(
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body: new 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: new TextField(
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style: const TextStyle(color: Colors.amber),
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controller: new 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(new MaterialApp(
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home: new Scaffold(
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body: new Center(
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child: new TextField(
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controller: new 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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await expectLater(tester, meetsGuideline(textContrastGuideline));
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handle.dispose();
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});
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testWidgets('grey text on white 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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new 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#21(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. '
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'The computed foreground color was: Color(0xfffafafa), '
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'The computed background color was: 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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});
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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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new SizedBox(
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width: 48.0,
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height: 48.0,
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child: new 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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new SizedBox(
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width: 47.0,
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height: 48.0,
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child: new 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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new SizedBox(
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width: 48.0,
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height: 47.0,
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child: new 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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new Transform.scale(
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scale: 0.5, // should have new height of 24 by 24.
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child: new SizedBox(
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width: 48.0,
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height: 48.0,
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child: new 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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new SizedBox(
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width: 48.0,
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height: 47.0,
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child: new 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#36(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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});
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}
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Widget _boilerplate(Widget child) {
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return new MaterialApp(
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home: new Scaffold(body: new Center(child: child)),
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);
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}
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