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[palette_generator] Add web support to unit tests (#4440)

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Updates the unit tests to run in web mode as well as VM mode, since the package supports web. To remove the file dependency, this adds base64-encoded versions of the existing test images. The originals are left as source-of-truth, in case we want to handle this differently in the future, or to visually inspect the images.

Fixes https://github.com/flutter/flutter/issues/129839
This commit is contained in:
stuartmorgan
2023-07-11 16:26:38 -04:00
committed by GitHub
parent 28c419d2ab
commit ba8974c744
4 changed files with 1360 additions and 23 deletions
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3
packages/palette_generator/dart_test.yaml
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@ -1,3 +0,0 @@
# TODO(stuartmorgan): Adjust the tests not to require dart:io
# See https://github.com/flutter/flutter/issues/129839
test_on: vm

1
packages/palette_generator/pubspec.yaml
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@ -12,7 +12,6 @@ dependencies:
collection: ^1.15.0
flutter:
sdk: flutter
path: ^1.8.0
dev_dependencies:
flutter_test:

1351
packages/palette_generator/test/encoded_images.dart Normal file
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28
packages/palette_generator/test/palette_generator_test.dart
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@ -2,14 +2,14 @@
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
import 'dart:io';
import 'dart:ui' as ui show Codec, FrameInfo, Image, instantiateImageCodec;
import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:palette_generator/palette_generator.dart';
import 'package:path/path.dart' as path;
import 'encoded_images.dart';
/// An image provider implementation for testing that takes a pre-loaded image.
/// This avoids handling asynchronous I/O in the test zone, which is
@ -41,12 +41,7 @@ class FakeImageProvider extends ImageProvider<FakeImageProvider> {
}
}
Future<FakeImageProvider> loadImage(String name) async {
File imagePath = File(path.joinAll(<String>['assets', name]));
if (path.split(Directory.current.absolute.path).last != 'test') {
imagePath = File(path.join('test', imagePath.path));
}
final Uint8List data = Uint8List.fromList(imagePath.readAsBytesSync());
Future<FakeImageProvider> loadImage(Uint8List data) async {
final ui.Codec codec = await ui.instantiateImageCodec(data);
final ui.FrameInfo frameInfo = await codec.getNextFrame();
return FakeImageProvider(frameInfo.image);
@ -55,17 +50,12 @@ Future<FakeImageProvider> loadImage(String name) async {
Future<void> main() async {
// Load the images outside of the test zone so that IO doesn't get
// complicated.
final List<String> imageNames = <String>[
'tall_blue',
'wide_red',
'dominant',
'landscape'
];
final Map<String, FakeImageProvider> testImages =
<String, FakeImageProvider>{};
for (final String name in imageNames) {
testImages[name] = await loadImage('$name.png');
}
final Map<String, FakeImageProvider> testImages = <String, FakeImageProvider>{
'tall_blue': await loadImage(kImageDataTallBlue),
'wide_red': await loadImage(kImageDataWideRed),
'dominant': await loadImage(kImageDataDominant),
'landscape': await loadImage(kImageDataLandscape),
};
testWidgets('Initialize the image cache', (WidgetTester tester) async {
// We need to have a testWidgets test in order to initialize the image