LibTest/typed_data/Uint8List/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.

/// @assertion E singleWhere(bool test(E element))
/// ...
/// Checks all elements to see if test(element) returns true. If exactly one
/// element satisfies test, that element is returned. 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 Uint8List.fromList([]);
  Expect.throws(() { l.singleWhere((e) => true); }, (e) => e is StateError);

  l = new Uint8List.fromList([1, 2, 3, 4, 5]);
  Expect.throws(() { l.singleWhere((e) => e == 0); }, (e) => e is StateError);

  l = new Uint8List.fromList([1, 2, 3, 4, 5]);
  Expect.throws(() { l.singleWhere((e) => false); }, (e) => e is StateError);
}