// Copyright (c) 2011, 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 double acos(num x)
/// Returns a value in the range 0..PI, or NaN if [x] is outside the range -1..1.
/// @description Checks returned values on arguments outside [-1, 1].
/// @author msyabro

import "dart:math" as Math;
import "../../Utils/expect.dart";

main() {
  Expect.isTrue(Math.acos(-10).isNaN);
  Expect.isTrue(Math.acos(10).isNaN);
  Expect.isTrue(Math.acos(1.0000000000001).isNaN);
  Expect.isTrue(Math.acos(-1.0000000000001).isNaN);

  Expect.isTrue(Math.acos(double.nan).isNaN);
  Expect.isTrue(Math.acos(double.infinity).isNaN);
  Expect.isTrue(Math.acos(double.negativeInfinity).isNaN);
}