js/src/tests/ecma_5/Date/equality-to-boolean.js@6474c204b198 (annotated)
js/src/tests/ecma_5/Date/equality-to-boolean.js
Wed, 31 Dec 2014 06:09:35 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Wed, 31 Dec 2014 06:09:35 +0100
- changeset 0
- 6474c204b198
- permissions
- -rw-r--r--
Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.
| michael@0 | 1 | // Any copyright is dedicated to the Public Domain. |
| michael@0 | 2 | // http://creativecommons.org/licenses/publicdomain/ |
| michael@0 | 3 | |
| michael@0 | 4 | //----------------------------------------------------------------------------- |
| michael@0 | 5 | print("Test for correct implementation of |Date == boolean| and vice versa"); |
| michael@0 | 6 | |
| michael@0 | 7 | /************** |
| michael@0 | 8 | * BEGIN TEST * |
| michael@0 | 9 | **************/ |
| michael@0 | 10 | |
| michael@0 | 11 | Date.prototype.toString = function() { return 1; }; |
| michael@0 | 12 | Date.prototype.valueOf = function() { return 0; }; |
| michael@0 | 13 | |
| michael@0 | 14 | /* |
| michael@0 | 15 | * ES5 11.9.3 doesn't directly handle obj == boolean. Instead it translates it |
| michael@0 | 16 | * as follows: |
| michael@0 | 17 | * |
| michael@0 | 18 | * obj == boolean |
| michael@0 | 19 | * ↳ obj == ToNumber(boolean), per step 7 |
| michael@0 | 20 | * ↳ ToPrimitive(obj) == ToNumber(boolean), per step 9 |
| michael@0 | 21 | * |
| michael@0 | 22 | * ToPrimitive calls [[DefaultValue]] with no hint. For Date objects this is |
| michael@0 | 23 | * treated as if it were instead called with hint String. That calls toString, |
| michael@0 | 24 | * which returns 1, so Date objects here should compare equal to true and |
| michael@0 | 25 | * unequal to false. |
| michael@0 | 26 | */ |
| michael@0 | 27 | assertEq(new Date == true, true); |
| michael@0 | 28 | assertEq(new Date == false, false); |
| michael@0 | 29 | |
| michael@0 | 30 | /* == is symmetric. */ |
| michael@0 | 31 | assertEq(true == new Date, true); |
| michael@0 | 32 | assertEq(false == new Date, false); |
| michael@0 | 33 | |
| michael@0 | 34 | /******************************************************************************/ |
| michael@0 | 35 | |
| michael@0 | 36 | if (typeof reportCompare === "function") |
| michael@0 | 37 | reportCompare(true, true); |
| michael@0 | 38 | |
| michael@0 | 39 | print("Tests complete"); |
