LibTest/collection/IterableMixin/forEach_A01_t03.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 f(E element))
/// Applies the function [f] to each element of this collection in iteration
/// order.
/// @description Checks that exception thrown in [f] breaks the iteration.


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

class MyIterable extends Object with IterableMixin {
  List _content;
  MyIterable(List list): _content = list;

  Iterator get iterator {
    return _content.iterator;
  }
}

check(List list, num init, combine, num expected) {
  IterableMixin iterable = new MyIterable(list);
  num actual = iterable.fold(init, combine);
  Expect.equals(expected, actual);
}	

main() {
  IterableMixin iterable = new MyIterable([1, 2]);

  int count = 0;
  try {
    iterable.forEach((var element) {
      throw ++count;
    });
  } on Object catch(e) {
    Expect.equals(1, count);
  }
}