// 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 operator -(num other)
/// @description Checks that if both operands are positive infinity or both
/// operands are negative infinity the result is NaN.
/// @author pagolubev

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

checkNaN(d) {
  var msg = 'Expected: NaN, actual: $d';
  Expect.isTrue(d.isNaN, msg);
}

main() {
  checkNaN(double.infinity - double.infinity);
  checkNaN(double.negativeInfinity - double.negativeInfinity);
}