| /* |
| * Any copyright is dedicated to the Public Domain. |
| * http://creativecommons.org/licenses/publicdomain/ |
| * Contributor: |
| * Jeff Walden <jwalden+code@mit.edu> |
| */ |
| |
| //----------------------------------------------------------------------------- |
| var BUGNUMBER = 657298; |
| var summary = 'Various quirks of setting array length properties to objects'; |
| |
| print(BUGNUMBER + ": " + summary); |
| |
| /************** |
| * BEGIN TEST * |
| **************/ |
| |
| function invokeConversionTwice1() |
| { |
| var count = 0; |
| [].length = { valueOf: function() { count++; return 1; } }; |
| assertEq(count, 2); |
| } |
| invokeConversionTwice1(); |
| |
| function invokeConversionTwice2() |
| { |
| var count = 0; |
| [].length = { toString: function() { count++; return 1; }, valueOf: null }; |
| assertEq(count, 2); |
| } |
| invokeConversionTwice2(); |
| |
| function dontOverwriteError1() |
| { |
| try |
| { |
| [].length = { valueOf: {}, toString: {} }; |
| throw new Error("didn't throw a TypeError"); |
| } |
| catch (e) |
| { |
| assertEq(e instanceof TypeError, true, |
| "expected a TypeError running out of conversion options, got " + e); |
| } |
| } |
| dontOverwriteError1(); |
| |
| function dontOverwriteError2() |
| { |
| try |
| { |
| [].length = { valueOf: function() { throw "error"; } }; |
| throw new Error("didn't throw a TypeError"); |
| } |
| catch (e) |
| { |
| assertEq(e, "error", "expected 'error' from failed conversion, got " + e); |
| } |
| } |
| dontOverwriteError2(); |
| |
| /******************************************************************************/ |
| |
| if (typeof reportCompare === "function") |
| reportCompare(true, true); |
| |
| print("All tests passed!"); |