LibTest/collection/UnmodifiableMapBase/forEach_A01_t03.test.dart

// Copyright (c) 2017, 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 forEach(void action(K key, V value))
/// Applies [f] to each key-value pair of the map.
/// @description Checks that an exception thrown by the argument
/// function breaks iteration and is passed through to the caller.
/// @author iarkh@unipro.ru

import "dart:collection";
import "../../../Utils/expect.dart";
import "unmodifiablemapbase.lib.dart";

main() {

  UnmodifiableMapBase base =
      new UnmodifiableMapBaseImpl({"1" : 3, "2" : 5, "3" : 8});
  
  int count = 0;
  try {
    base.forEach((var key, Object value) {
      if (count++ > 0) throw "stop";
    });
    Expect.fail("Exception expected");
  } on String catch(e) {}

  Expect.isTrue(count == 2);
}