LibTest/async/Zone/bindCallbackGuarded_A01_t02.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.

/// @assertion void Function() bindCallbackGuarded(void callback())
///    Registers the provided callback and returns a function that will execute
/// in this zone.
///    When the function executes, errors are caught and treated as uncaught
/// errors.
///    Equivalent to:
///  ZoneCallback registered = this.registerCallback(callback);
///  return () => this.runGuarded(registered);
/// @description Checks that synchronous [callback] errors are caught in zone
/// @author a.semenov@unipro.ru

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

main() {
  int handlerCallCount = 0;
  var caughtError = null;

  void handler(Zone self, ZoneDelegate parent, Zone zone, e, st) {
    handlerCallCount++;
    caughtError = e;
  }

  Zone zone = Zone.current.fork(
      specification: new ZoneSpecification(
          handleUncaughtError: handler
      )
  );

  void callback() {
    throw "callback error";
  }

  void Function() boundCallback = zone.bindCallbackGuarded(callback);
  boundCallback();
  Expect.equals(1, handlerCallCount);
  Expect.equals("callback error", caughtError);
}