LibTest/core/double/operator_addition_A01_t04.dart

// 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.

// @dart = 2.9

/// @assertion double operator +(num other)
/// @description Checks that if one operand is a positive infinity and the other
/// is a negative infinity the result is NaN.
/// @author pagolubev

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


final double positive_infinity = 1 / 0;
final double negative_infinity = -1 / 0;

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

main() {  
  checkNaN(positive_infinity + negative_infinity);
  checkNaN(negative_infinity + positive_infinity);

  checkNaN(double.infinity + double.negativeInfinity);
  checkNaN(double.negativeInfinity + double.infinity);
}