| // Copyright (c) 2015, 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. |
| |
| /// Helper utilities for testing. |
| library async.test.util; |
| |
| import "dart:async"; |
| import "package:test/test.dart"; |
| |
| /// A zero-millisecond timer should wait until after all microtasks. |
| Future flushMicrotasks() => new Future.delayed(Duration.ZERO); |
| |
| /// A generic unreachable callback function. |
| /// |
| /// Returns a function that fails the test if it is ever called. |
| unreachable(String name) => ([a, b]) => fail("Unreachable: $name"); |
| |
| /// A badly behaved stream which throws if it's ever listened to. |
| /// |
| /// Can be used to test cases where a stream should not be used. |
| class UnusableStream extends Stream { |
| listen(onData, {onError, onDone, cancelOnError}) { |
| throw new UnimplementedError("Gotcha!"); |
| } |
| } |
| |
| /// A dummy [StreamSink] for testing the routing of the [done] and [close] |
| /// futures. |
| /// |
| /// The [completer] field allows the user to control the future returned by |
| /// [done] and [close]. |
| class CompleterStreamSink<T> implements StreamSink<T> { |
| final completer = new Completer(); |
| |
| Future get done => completer.future; |
| |
| void add(T event) {} |
| void addError(error, [StackTrace stackTrace]) {} |
| Future addStream(Stream<T> stream) async {} |
| Future close() => completer.future; |
| } |