/
build_step_impl_test.dart
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/
build_step_impl_test.dart
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// Copyright (c) 2016, the Dart project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.
@TestOn('vm')
import 'dart:async';
import 'dart:convert';
import 'package:build/build.dart';
import 'package:build/src/builder/build_step.dart';
import 'package:build/src/builder/build_step_impl.dart';
import 'package:build_resolvers/build_resolvers.dart';
import 'package:build_test/build_test.dart';
import 'package:test/test.dart';
void main() {
late ResourceManager resourceManager;
setUp(() {
resourceManager = ResourceManager();
});
tearDown(() async {
await resourceManager.disposeAll();
});
group('with reader/writer stub', () {
late AssetId primary;
late BuildStepImpl buildStep;
late List<AssetId> outputs;
setUp(() {
var reader = StubAssetReader();
var writer = StubAssetWriter();
primary = makeAssetId();
outputs = List.generate(5, (index) => makeAssetId());
buildStep = BuildStepImpl(primary, outputs, reader, writer,
AnalyzerResolvers(), resourceManager);
});
test('doesnt allow non-expected outputs', () {
var id = makeAssetId();
expect(() => buildStep.writeAsString(id, '$id'),
throwsA(TypeMatcher<UnexpectedOutputException>()));
expect(() => buildStep.writeAsBytes(id, [0]),
throwsA(TypeMatcher<UnexpectedOutputException>()));
});
test('reports allowed outputs', () {
expect(buildStep.allowedOutputs, outputs);
});
test('fetchResource can fetch resources', () async {
var expected = 1;
var intResource = Resource(() => expected);
var actual = await buildStep.fetchResource(intResource);
expect(actual, expected);
});
test('does not allow multiple writes to the same output', () async {
final id = outputs.first;
await buildStep.writeAsString(id, 'foo');
final expectedException = isA<InvalidOutputException>()
.having((e) => e.assetId, 'assetId', id)
.having((e) => e.message, 'message', contains('already wrote to'));
expect(
() => buildStep.writeAsString(id, 'bar'), throwsA(expectedException));
expect(() => buildStep.writeAsBytes(id, []), throwsA(expectedException));
});
});
group('with in memory file system', () {
late InMemoryAssetWriter writer;
late InMemoryAssetReader reader;
setUp(() {
writer = InMemoryAssetWriter();
reader = InMemoryAssetReader.shareAssetCache(writer.assets);
});
test('tracks outputs created by a builder', () async {
var builder = TestBuilder();
var primary = makeAssetId('a|web/primary.txt');
var inputs = {
primary: 'foo',
};
addAssets(inputs, writer);
var outputId = AssetId.parse('$primary.copy');
var buildStep = BuildStepImpl(primary, [outputId], reader, writer,
AnalyzerResolvers(), resourceManager);
await builder.build(buildStep);
await buildStep.complete();
// One output.
expect(writer.assets[outputId], decodedMatches('foo'));
});
group('resolve', () {
test('can resolve assets', () async {
var inputs = {
makeAssetId('a|web/a.dart'): '''
library a;
import 'b.dart';
''',
makeAssetId('a|web/b.dart'): '''
library b;
''',
};
addAssets(inputs, writer);
var primary = makeAssetId('a|web/a.dart');
var buildStep = BuildStepImpl(
primary, [], reader, writer, AnalyzerResolvers(), resourceManager);
var resolver = buildStep.resolver;
var aLib = await resolver.libraryFor(primary);
expect(aLib.name, 'a');
expect(aLib.importedLibraries.length, 2);
expect(aLib.importedLibraries.any((library) => library.name == 'b'),
isTrue);
var bLib = await resolver.findLibraryByName('b');
expect(bLib!.name, 'b');
expect(bLib.importedLibraries.length, 1);
await buildStep.complete();
});
});
});
group('With slow writes', () {
late BuildStepImpl buildStep;
late SlowAssetWriter assetWriter;
late AssetId outputId;
late String outputContent;
setUp(() async {
var primary = makeAssetId();
assetWriter = SlowAssetWriter();
outputId = makeAssetId('a|test.txt');
outputContent = '$outputId';
buildStep = BuildStepImpl(primary, [outputId], StubAssetReader(),
assetWriter, AnalyzerResolvers(), resourceManager);
});
test('Completes only after writes finish', () async {
unawaited(buildStep.writeAsString(outputId, outputContent));
var isComplete = false;
unawaited(buildStep.complete().then((_) {
isComplete = true;
}));
await Future(() {});
expect(isComplete, false,
reason: 'File has not written, should not be complete');
assetWriter.finishWrite();
await Future(() {});
expect(isComplete, true, reason: 'File is written, should be complete');
});
test('Completes only after async writes finish', () async {
var outputCompleter = Completer<String>();
unawaited(buildStep.writeAsString(outputId, outputCompleter.future));
var isComplete = false;
unawaited(buildStep.complete().then((_) {
isComplete = true;
}));
await Future(() {});
expect(isComplete, false,
reason: 'File has not resolved, should not be complete');
outputCompleter.complete(outputContent);
await Future(() {});
expect(isComplete, false,
reason: 'File has not written, should not be complete');
assetWriter.finishWrite();
await Future(() {});
expect(isComplete, true, reason: 'File is written, should be complete');
});
});
group('With erroring writes', () {
late AssetId primary;
late BuildStepImpl buildStep;
late AssetId output;
setUp(() {
var reader = StubAssetReader();
var writer = StubAssetWriter();
primary = makeAssetId();
output = makeAssetId();
buildStep = BuildStepImpl(primary, [output], reader, writer,
AnalyzerResolvers(), resourceManager,
stageTracker: NoOpStageTracker.instance);
});
test('Captures failed asynchronous writes', () {
buildStep.writeAsString(output, Future.error('error'));
expect(buildStep.complete(), throwsA('error'));
});
});
test('reportUnusedAssets forwards calls if provided', () {
var reader = StubAssetReader();
var writer = StubAssetWriter();
var unused = <AssetId>{};
var buildStep = BuildStepImpl(
makeAssetId(), [], reader, writer, AnalyzerResolvers(), resourceManager,
reportUnusedAssets: unused.addAll);
var reported = [
makeAssetId(),
makeAssetId(),
makeAssetId(),
];
buildStep.reportUnusedAssets(reported);
expect(unused, equals(reported));
});
}
class SlowAssetWriter implements AssetWriter {
final _writeCompleter = Completer<void>();
void finishWrite() {
_writeCompleter.complete(null);
}
@override
Future<void> writeAsBytes(AssetId id, FutureOr<List<int>> bytes) =>
_writeCompleter.future;
@override
Future<void> writeAsString(AssetId id, FutureOr<String> contents,
{Encoding encoding = utf8}) =>
_writeCompleter.future;
}