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ccd070a5b4
Add back screenshot extension that was temporarily disabled. Add matchesReferenceImage matcher to test that the screenshot extension generates equivalent images to InspectorService.instance.screenshot.
69 lines
2.4 KiB
Dart
69 lines
2.4 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 'dart:ui' as ui;
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import 'package:flutter_test/flutter_test.dart';
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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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createTestImage(100, 100, red),
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matchesReferenceImage(createTestImage(100, 100, red)),
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);
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await expectLater(
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createTestImage(100, 100, green),
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matchesReferenceImage(createTestImage(100, 100, green)),
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);
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await expectLater(
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createTestImage(100, 100, transparentRed),
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matchesReferenceImage(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 = 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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expect(
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await matchesReferenceImage(createTestImage(50, 50, red)).matchAsync(createTestImage(100, 100, red)),
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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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expect(
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await matchesReferenceImage(createTestImage(100, 100, red)).matchAsync(createTestImage(100, 100, transparentRed)),
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equals('does not match on 53 pixels'),
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);
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expect(
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await matchesReferenceImage(createTestImage(100, 100, red)).matchAsync(createTestImage(100, 100, green)),
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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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