| // Copyright (c) 2013, 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. |
| |
| // @dart = 2.9 |
| |
| import 'package:async_helper/async_helper.dart'; |
| import "package:expect/expect.dart"; |
| import 'dart:async'; |
| import 'catch_errors.dart'; |
| |
| main() { |
| asyncStart(); |
| Completer done = new Completer(); |
| |
| var events = []; |
| // Work around bug that makes scheduleMicrotask use Timers. By invoking |
| // `scheduleMicrotask` here we make sure that asynchronous non-timer events |
| // are executed before any Timer events. |
| scheduleMicrotask(() {}); |
| |
| // Test that errors are caught by nested `catchErrors`. Also uses |
| // `scheduleMicrotask` in the body of a Timer. |
| bool outerTimerRan = false; |
| int outerTimerCounterDelayCount = 0; |
| catchErrors(() { |
| events.add("catch error entry"); |
| catchErrors(() { |
| events.add("catch error entry2"); |
| Timer.run(() { |
| throw "timer error"; |
| }); |
| |
| // We want this timer to run after the timer below. When the machine is |
| // slow we saw that the timer below was scheduled more than 50ms after |
| // this line. A duration of 50ms was therefore not enough to guarantee |
| // that this timer runs before the timer below. |
| // Instead of increasing the duration to a bigger amount we decided to |
| // verify that the other timer already ran, and reschedule if not. |
| // This way we could reduce the timeout (to 10ms now), while still |
| // allowing for more time, in case the machine is slow. |
| void runDelayed() { |
| new Timer(const Duration(milliseconds: 10), () { |
| if (outerTimerRan) { |
| scheduleMicrotask(() { |
| throw "scheduleMicrotask"; |
| }); |
| throw "delayed error"; |
| } else if (outerTimerCounterDelayCount < 100) { |
| outerTimerCounterDelayCount++; |
| runDelayed(); |
| } |
| }); |
| } |
| |
| runDelayed(); |
| }).listen((x) { |
| events.add(x); |
| if (x == "scheduleMicrotask") { |
| throw "inner done throw"; |
| } |
| }); |
| events.add("after inner"); |
| Timer.run(() { |
| outerTimerRan = true; |
| throw "timer outer"; |
| }); |
| throw "inner throw"; |
| }).listen((x) { |
| events.add(x); |
| if (x == "inner done throw") done.complete(true); |
| }, onDone: () { |
| Expect.fail("Unexpected callback"); |
| }); |
| |
| done.future.whenComplete(() { |
| // Give callbacks time to run. |
| Timer.run(() { |
| Expect.listEquals([ |
| "catch error entry", |
| "catch error entry2", |
| "after inner", |
| "main exit", |
| "inner throw", |
| "timer error", |
| "timer outer", |
| "delayed error", |
| "scheduleMicrotask", |
| "inner done throw" |
| ], events); |
| asyncEnd(); |
| }); |
| }); |
| events.add("main exit"); |
| } |