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// Copyright 2013 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
import 'dart:async';
import 'dart:convert';
import 'dart:typed_data';
import 'dart:ui';
import 'package:litetest/litetest.dart';
void main() {
test('Loading an asset that does not exist returns null', () async {
Object? error;
try {
await ImmutableBuffer.fromAsset('ThisDoesNotExist');
} catch (err) {
error = err;
}
expect(error, isNotNull);
expect(error is Exception, true);
});
test('Loading a file that does not exist returns null', () async {
Object? error;
try {
await ImmutableBuffer.fromFilePath('ThisDoesNotExist');
} catch (err) {
error = err;
}
expect(error, isNotNull);
expect(error is Exception, true);
});
test('returns the bytes of a bundled asset', () async {
final ImmutableBuffer buffer = await ImmutableBuffer.fromAsset('DashInNooglerHat.jpg');
expect(buffer.length == 354679, true);
});
test('returns the bytes of a file', () async {
final ImmutableBuffer buffer = await ImmutableBuffer.fromFilePath('flutter/lib/ui/fixtures/DashInNooglerHat.jpg');
expect(buffer.length == 354679, true);
});
test('Can load an asset with a space in the key', () async {
// This assets actual path is "fixtures/DashInNooglerHat%20WithSpace.jpg"
final ImmutableBuffer buffer = await ImmutableBuffer.fromAsset('DashInNooglerHat WithSpace.jpg');
expect(buffer.length == 354679, true);
});
test('can dispose immutable buffer', () async {
final ImmutableBuffer buffer = await ImmutableBuffer.fromAsset('DashInNooglerHat.jpg');
buffer.dispose();
});
test('Tester can disable loading fonts from an asset bundle', () async {
final List<int> ahemImage = await _createPictureFromFont('Ahem');
// Font that is bundled in the asset directory of the test runner.
final List<int> bundledFontImage = await _createPictureFromFont('Roboto');
// Bundling fonts is disabled, so the font selected in both cases should be ahem.
// Therefore each buffer will contain identical contents.
expect(ahemImage, equals(bundledFontImage));
});
test('Tester can still load through dart:ui', () async {
/// Manually load font asset through dart.
final Uint8List encoded = utf8.encoder.convert(Uri(path: Uri.encodeFull('Roboto-Medium.ttf')).path);
final Completer<Uint8List> result = Completer<Uint8List>();
window.sendPlatformMessage('flutter/assets', encoded.buffer.asByteData(), (ByteData? data) {
result.complete(data!.buffer.asUint8List());
});
await loadFontFromList(await result.future, fontFamily: 'Roboto2');
final List<int> ahemImage = await _createPictureFromFont('Ahem');
// Font that is bundled in the asset directory of the test runner.
final List<int> bundledFontImage = await _createPictureFromFont('Roboto2');
// Bundling fonts is disabled, so the font selected in both cases should be ahem.
// Therefore each buffer will contain identical contents.
expect(ahemImage, notEquals(bundledFontImage));
});
}
Future<List<int>> _createPictureFromFont(String fontFamily) async {
final ParagraphBuilder builder = ParagraphBuilder(ParagraphStyle(
fontFamily: fontFamily,
fontStyle: FontStyle.normal,
fontWeight: FontWeight.normal,
fontSize: 20,
));
builder.addText('Test');
final Paragraph paragraph = builder.build();
paragraph.layout(const ParagraphConstraints(width: 20 * 5.0));
final PictureRecorder recorder = PictureRecorder();
final Canvas canvas = Canvas(recorder);
canvas.drawParagraph(paragraph, Offset.zero);
final Picture picture = recorder.endRecording();
final Image image = await picture.toImage(100, 100);
final ByteData? data = await image.toByteData();
return data!.buffer.asUint8List().toList();
}