// 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 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 there are no matching
/// elements, or if there is more than one matching element.
/// @author ngl@unipro.ru


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

Float64x2 f64x2(v) => new Float64x2.splat(v);

listEquals(Float64x2List expected, Float64x2List actual) {
  Expect.equals(expected.length, actual.length);
  for (int i = 0; i < expected.length; ++i) {
    Expect.equals(expected[i].x, actual[i].x);
    Expect.equals(expected[i].y, actual[i].y);
  }
}

main() {
  var l = new Float64x2List.fromList([
    f64x2(1.0), f64x2(2.0), f64x2(2.0), f64x2(3.0), f64x2(4.0,), f64x2(5.0)
  ]);

  try {
    l.singleWhere((e) => e.x > 5.0);
    Expect.fail("State error is expected");
  } on StateError {}

  try {
    l.singleWhere((e) => e.y == 2.0);
    Expect.fail("State error is expected");
  } on StateError {}
}