LibTest/typed_data/Float32List/singleWhere_A02_t02.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))
/// ...
/// 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 more than one element
/// match [test].
/// @author msyabro

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

main() {
  var l = new Float32List.fromList([1.0, 2.0, 3.0, 4.0, 5.0]);
  try {
    l.singleWhere((e) => true);
    Expect.fail("StateError is expected");
  } on StateError {}

  l = new Float32List.fromList([1.0, 2.0, 3.0, 4.0, 5.0]);
  try {
    l.singleWhere((e) => e != 0.0);
    Expect.fail("StateError is expected");
  } on StateError {}
}