Lasse Reichstein Holst Nielsen
a957c4351a
Change-Id: Icadb9edfe2ef40aff3808295685f961897d63c9a Reviewed-on: https://dart-review.googlesource.com/c/86181 Reviewed-by: Lasse R.H. Nielsen <lrn@google.com> Commit-Queue: Lasse R.H. Nielsen <lrn@google.com>
47 lines
1.2 KiB
Dart
47 lines
1.2 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 stream cancellation is checked immediately after delivering the
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// event, and before continuing after the yield.
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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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main() async {
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asyncStart();
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var log = [];
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Stream<int> f() async* {
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try {
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log.add("-1");
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yield 1;
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log.add("-2");
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yield 2;
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} finally {
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log.add("x");
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}
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}
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var completer = Completer();
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var s;
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s = f().listen((e) {
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log.add("+$e");
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// The `cancel` operation makes all `yield` operations act as returns.
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// It should make the `finally` block in `f` log an "x",
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// and nothing else.
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completer.complete(s.cancel());
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}, onError: (e) {
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// Should never be reached, but if it does, we'll make the await
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// below terminate.
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completer.complete(new Future.sync(() {
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Expect.fail("$e");
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}));
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}, onDone: () {
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completer.complete(null);
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});
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await completer.future;
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Expect.listEquals(["-1", "+1", "x"], log, "cancel");
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asyncEnd();
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}
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