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comparison: js/src/tests/ecma_5/Date/equality-to-boolean.js
js/src/tests/ecma_5/Date/equality-to-boolean.js
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| 1 // Any copyright is dedicated to the Public Domain. | |
| 2 // http://creativecommons.org/licenses/publicdomain/ | |
| 3 | |
| 4 //----------------------------------------------------------------------------- | |
| 5 print("Test for correct implementation of |Date == boolean| and vice versa"); | |
| 6 | |
| 7 /************** | |
| 8 * BEGIN TEST * | |
| 9 **************/ | |
| 10 | |
| 11 Date.prototype.toString = function() { return 1; }; | |
| 12 Date.prototype.valueOf = function() { return 0; }; | |
| 13 | |
| 14 /* | |
| 15 * ES5 11.9.3 doesn't directly handle obj == boolean. Instead it translates it | |
| 16 * as follows: | |
| 17 * | |
| 18 * obj == boolean | |
| 19 * ↳ obj == ToNumber(boolean), per step 7 | |
| 20 * ↳ ToPrimitive(obj) == ToNumber(boolean), per step 9 | |
| 21 * | |
| 22 * ToPrimitive calls [[DefaultValue]] with no hint. For Date objects this is | |
| 23 * treated as if it were instead called with hint String. That calls toString, | |
| 24 * which returns 1, so Date objects here should compare equal to true and | |
| 25 * unequal to false. | |
| 26 */ | |
| 27 assertEq(new Date == true, true); | |
| 28 assertEq(new Date == false, false); | |
| 29 | |
| 30 /* == is symmetric. */ | |
| 31 assertEq(true == new Date, true); | |
| 32 assertEq(false == new Date, false); | |
| 33 | |
| 34 /******************************************************************************/ | |
| 35 | |
| 36 if (typeof reportCompare === "function") | |
| 37 reportCompare(true, true); | |
| 38 | |
| 39 print("Tests complete"); |
