| /* |
| * 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) |
| * Converts x to a double and returns its arc cosine in radians. |
| * Throws an error if [x] is null. |
| * @description Checks that Error is thrown when an argument is a null (not |
| * a number). |
| * @author msyabro |
| * @reviewer pagolubev |
| * @needsreview undocumented |
| */ |
| |
| import "dart:math" as Math; |
| import "../../Utils/expect.dart"; |
| |
| main() { |
| Expect.throws(() { |
| Math.acos(null); |
| }); |
| } |
