LibTest/typed_data/Int32List/singleWhere_A02_t01.dart

// Copyright (c) 2013, 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 E singleWhere(bool test(E element))
/// ...
/// Otherwise, if there are no matching elements, or if there is more than one
/// matching element, a StateError is thrown.
/// @description Checks that a [StateError] is thrown if no element matches
/// [test].
/// @author msyabro


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

main() {
  var l = new Int32List.fromList([]);
  try {
    l.singleWhere((e) => true);
    Expect.fail("StateError is expected");
  } on StateError {}

  l = new Int32List.fromList([1, 2, 3, 4, 5]);
  try {
    l.singleWhere((e) => e == 0);
    Expect.fail("StateError is expected");
  } on StateError {}

  l = new Int32List.fromList([1, 2, 3, 4, 5]);
  try {
    l.singleWhere((e) => false);
    Expect.fail("StateError is expected");
  } on StateError {}
}