| /* |
| * Any copyright is dedicated to the Public Domain. |
| * http://creativecommons.org/licenses/publicdomain/ |
| */ |
| |
| //----------------------------------------------------------------------------- |
| var BUGNUMBER = 537863; |
| var summary = |
| 'undefined, Infinity, and NaN global properties should not be writable'; |
| |
| print(BUGNUMBER + ": " + summary); |
| |
| /************** |
| * BEGIN TEST * |
| **************/ |
| |
| var desc, old, error; |
| var global = this; |
| |
| var names = ["NaN", "Infinity", "undefined"]; |
| |
| for (var i = 0; i < names.length; i++) |
| { |
| var name = names[i]; |
| desc = Object.getOwnPropertyDescriptor(global, name); |
| assertEq(desc !== undefined, true, name + " should be present"); |
| assertEq(desc.enumerable, false, name + " should not be enumerable"); |
| assertEq(desc.configurable, false, name + " should not be configurable"); |
| assertEq(desc.writable, false, name + " should not be writable"); |
| |
| old = global[name]; |
| global[name] = 17; |
| assertEq(global[name], old, name + " changed on setting?"); |
| |
| error = "before"; |
| try |
| { |
| throw new TypeError("SpiderMonkey doesn't currently implement " + |
| "strict-mode throwing when setting a readonly " + |
| "property, not running this bit of test for now; " + |
| "see bug 537873"); |
| |
| (function() { "use strict"; global[name] = 42; error = "didn't throw"; })(); |
| } |
| catch (e) |
| { |
| if (e instanceof TypeError) |
| error = "typeerror"; |
| else |
| error = "bad exception: " + e; |
| } |
| assertEq(error, "typeerror", "wrong strict mode error setting " + name); |
| } |
| |
| /******************************************************************************/ |
| |
| reportCompare(true, true); |
| |
| print("All tests passed!"); |