Lasse R.H. Nielsen
64 lines
1.8 KiB
Dart
64 lines
1.8 KiB
Dart
// 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.
|
|
|
|
// Test empty stream.
|
|
import "package:expect/expect.dart";
|
|
import "dart:async";
|
|
import 'package:async_helper/async_helper.dart';
|
|
|
|
main() {
|
|
asyncStart();
|
|
runTest().whenComplete(asyncEnd);
|
|
}
|
|
|
|
Future runTest() async {
|
|
unreachable([a,b]) { throw "UNREACHABLE"; }
|
|
int tick = 0;
|
|
ticker() { tick++; }
|
|
|
|
asyncStart();
|
|
|
|
Stream<int> s = const Stream<int>.empty(); // Is const constructor.
|
|
Expect.isFalse(s is Stream<String>); // Respects type parameter.
|
|
StreamSubscription<int> sub =
|
|
s.listen(unreachable, onError: unreachable, onDone: ticker);
|
|
Expect.isFalse(sub is StreamSubscription<String>); // Type parameter in sub.
|
|
|
|
// Doesn't do callback in response to listen.
|
|
Expect.equals(tick, 0);
|
|
await flushMicrotasks();
|
|
// Completes eventually.
|
|
Expect.equals(tick, 1);
|
|
|
|
// It's a broadcast stream - can listen twice.
|
|
Expect.isTrue(s.isBroadcast);
|
|
StreamSubscription<int> sub2 =
|
|
s.listen(unreachable, onError: unreachable, onDone: unreachable);
|
|
// respects pause.
|
|
sub2.pause();
|
|
await flushMicrotasks();
|
|
// respects cancel.
|
|
sub2.cancel();
|
|
await flushMicrotasks();
|
|
Expect.equals(tick, 1);
|
|
// Still not complete.
|
|
|
|
StreamSubscription<int> sub3 =
|
|
s.listen(unreachable, onError: unreachable, onDone: ticker);
|
|
// respects pause.
|
|
sub3.pause();
|
|
Expect.equals(tick, 1);
|
|
await flushMicrotasks();
|
|
// Doesn't complete while paused.
|
|
Expect.equals(tick, 1);
|
|
sub3.resume();
|
|
await flushMicrotasks();
|
|
// Now completed.
|
|
Expect.equals(tick, 2);
|
|
|
|
asyncEnd();
|
|
}
|
|
|
|
Future flushMicrotasks() => new Future.delayed(Duration.ZERO);
|