LibTest/collection/IterableMixin/firstWhere_A03_t01.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.

/// @assertion E firstWhere(bool test(E value), { E orElse() })
/// If no element satisfies [test], the result of invoking the [orElse] function
/// is returned.
/// @description Checks that [orElse] is called if no elements which satisfy
/// [test] condition.
/// @author iarkh@unipro.ru

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

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

  Iterator get iterator {
    return _content.iterator;
  }
}

class TestException {}

check(List list) {
  MyIterable iterable = new MyIterable(list);
  Expect.throws(() {
      iterable.firstWhere((value) => false, orElse: () {
        throw new TestException();
      });
    }, (e) => e is TestException);
  }

main() {
  check([1, 2, -3, 4, 128]);
  check([1, 2, 128, "testme", 33, 0, new Object(), [], 0, 0]);
  check([]);
}