LibTest/async/Zone/handleUncaughtError_A01_t04.dart

// Copyright (c) 2011, 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

/// @assertion void handleUncaughtError(error, StackTrace stackTrace)
///  Handles uncaught asynchronous errors.
/// @description Checks that handleUncaughtError callback can be set via
/// ZoneSpecification and that correct callback is invoked. Async case.
/// @author ilya


import "dart:async";
import "../../../Utils/expect.dart";

int count = 0;
var stackTraces={};

HandleUncaughtErrorHandler newHandler() {
  int id = ++count;
  return (Zone self, ZoneDelegate parent, Zone zone, e, st) {
    //print('Error handler #$id');
    Expect.identical(id, e);
    Expect.identical(stackTraces[id], st);
    asyncEnd();
  };
}

Zone newErrorZone(Zone z) =>
  z.fork(specification: new ZoneSpecification(handleUncaughtError: newHandler()));

void test() {
  try {
    throw count; // i-th error should be caught by i-th handler
  } catch (e, st) {
    stackTraces[count] = st;

    asyncMultiStart(2);

    new Future.error(e,st);

    runZoned(() {
      // in same error zone as parent zone
      new Future.error(e,st);
    });
  }

  if (count < 10) {
    newErrorZone(Zone.current).run(test);
  }
}

main() {
  newErrorZone(Zone.current).run(test);
}