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https://github.com/flutter/flutter
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74 lines
2.7 KiB
Dart
74 lines
2.7 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 'dart:ui' as ui;
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import 'package:flutter_test/flutter_test.dart';
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Future<ui.Image> createTestImage(int width, int height, ui.Color color) {
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final ui.Paint paint = ui.Paint()
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..style = ui.PaintingStyle.stroke
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..strokeWidth = 1.0
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..color = color;
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final ui.PictureRecorder recorder = ui.PictureRecorder();
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final ui.Canvas pictureCanvas = ui.Canvas(recorder);
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pictureCanvas.drawCircle(Offset.zero, 20.0, paint);
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final ui.Picture picture = recorder.endRecording();
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return picture.toImage(width, height);
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}
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void main() {
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const ui.Color red = ui.Color.fromARGB(255, 255, 0, 0);
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const ui.Color green = ui.Color.fromARGB(255, 0, 255, 0);
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const ui.Color transparentRed = ui.Color.fromARGB(128, 255, 0, 0);
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group('succeeds', () {
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testWidgets('when images have the same content', (WidgetTester tester) async {
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await expectLater(
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await createTestImage(100, 100, red),
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matchesReferenceImage(await createTestImage(100, 100, red)),
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);
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await expectLater(
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await createTestImage(100, 100, green),
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matchesReferenceImage(await createTestImage(100, 100, green)),
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);
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await expectLater(
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await createTestImage(100, 100, transparentRed),
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matchesReferenceImage(await createTestImage(100, 100, transparentRed)),
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);
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});
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testWidgets('when images are identical', (WidgetTester tester) async {
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final ui.Image image = await createTestImage(100, 100, red);
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await expectLater(image, matchesReferenceImage(image));
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});
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});
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group('fails', () {
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testWidgets('when image sizes do not match', (WidgetTester tester) async {
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final ui.Image red50 = await createTestImage(50, 50, red);
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final ui.Image red100 = await createTestImage(100, 100, red);
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expect(
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await matchesReferenceImage(red50).matchAsync(red100),
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equals('does not match as width or height do not match. [100×100] != [50×50]'),
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);
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});
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testWidgets('when image pixels do not match', (WidgetTester tester) async {
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final ui.Image red100 = await createTestImage(100, 100, red);
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final ui.Image transparentRed100 = await createTestImage(100, 100, transparentRed);
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expect(
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await matchesReferenceImage(red100).matchAsync(transparentRed100),
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equals('does not match on 57 pixels'),
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);
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final ui.Image green100 = await createTestImage(100, 100, green);
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expect(
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await matchesReferenceImage(red100).matchAsync(green100),
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equals('does not match on 57 pixels'),
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);
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});
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});
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}
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