Robert Nystrom
2034061433
Change-Id: I313a57ed7c7ea2ada75065f55a7367376f6bdae5 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/152183 Commit-Queue: Bob Nystrom <rnystrom@google.com> Auto-Submit: Bob Nystrom <rnystrom@google.com> Reviewed-by: Srujan Gaddam <srujzs@google.com>
49 lines
1.5 KiB
Dart
49 lines
1.5 KiB
Dart
// Copyright (c) 2018, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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// Test that async/await syntax works for synchronously completed futures.
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// Such futures are used by Flutter (see http://dartbug.com/32098).
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import 'dart:async';
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import 'package:expect/expect.dart';
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import 'package:async_helper/async_helper.dart';
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class SynchronousFuture<T> implements Future<T> {
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final T v;
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SynchronousFuture(this.v);
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Future<E> then<E>(FutureOr<E> f(T v), {Function? onError}) {
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final u = f(v);
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return u is Future<dynamic>
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? (u as Future<dynamic>).then((v) => v as E)
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: new SynchronousFuture<E>(u);
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}
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Stream<T> asStream() => throw 'unimplemented';
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Future<T> catchError(Function onError, {bool test(Object error)?}) =>
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throw 'unimplemented';
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Future<T> timeout(Duration timeLimit, {dynamic onTimeout()?}) =>
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throw 'unimplemented';
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Future<T> whenComplete(dynamic action()) => throw 'unimplemented';
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}
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void main() {
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var stage = 0;
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asyncTest(() async {
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int v;
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Expect.equals(0, stage++);
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v = await new SynchronousFuture<int>(stage);
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Expect.equals(1, v);
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Expect.equals(1, stage++);
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v = await new SynchronousFuture<int>(stage);
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Expect.equals(2, v);
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Expect.equals(2, stage++);
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v = await new SynchronousFuture<int>(stage);
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Expect.equals(3, v);
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Expect.equals(3, stage++);
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});
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}
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