| // 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 atan(num x) |
| /// Returns a value in the range -PI/2..PI/2, or NaN if [x] is NaN. |
| /// @description Checks that [atan] returns NaN if [x] is NaN. |
| /// @author msyabro |
| |
| |
| import "dart:math" as Math; |
| import "../../Utils/expect.dart"; |
| |
| main() { |
| Expect.isTrue(Math.atan(double.nan).isNaN); |
| } |
