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Object.prototype.toString: avoid over-DRYness, and add preconditions

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Jordan Harband 2023-03-24 15:20:09 -07:00 committed by Ms2ger
parent 4a6439e4a7
commit 910a2764d8
1 changed files with 17 additions and 14 deletions
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31
test/built-ins/Object/prototype/toString/symbol-tag-non-str-builtin.js vendored
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@ -15,62 +15,65 @@ features: [Symbol.toStringTag, Symbol.iterator, generators, WeakMap]
---*/ ---*/
var toString = Object.prototype.toString; var toString = Object.prototype.toString;
var defaultTag = '[object Object]';
delete Symbol.prototype[Symbol.toStringTag]; delete Symbol.prototype[Symbol.toStringTag];
assert.sameValue(toString.call(Symbol('desc')), defaultTag); assert.sameValue(toString.call(Symbol('desc')), '[object Object]');
Object.defineProperty(Math, Symbol.toStringTag, {value: Symbol()}); Object.defineProperty(Math, Symbol.toStringTag, {value: Symbol()});
assert.sameValue(toString.call(Math), defaultTag); assert.sameValue(toString.call(Math), '[object Object]');
var strIter = ''[Symbol.iterator](); var strIter = ''[Symbol.iterator]();
var strIterProto = Object.getPrototypeOf(strIter); var strIterProto = Object.getPrototypeOf(strIter);
assert.sameValue(toString.call(strIter), '[object String Iterator]');
delete strIterProto[Symbol.toStringTag]; delete strIterProto[Symbol.toStringTag];
assert.sameValue(toString.call(strIter), defaultTag); assert.sameValue(toString.call(strIter), '[object Object]');
var arrIter = [][Symbol.iterator](); var arrIter = [][Symbol.iterator]();
var arrIterProto = Object.getPrototypeOf(arrIter) var arrIterProto = Object.getPrototypeOf(arrIter)
assert.sameValue(toString.call(arrIter), '[object Array Iterator]');
Object.defineProperty(arrIterProto, Symbol.toStringTag, {value: null}); Object.defineProperty(arrIterProto, Symbol.toStringTag, {value: null});
assert.sameValue(toString.call(arrIter), defaultTag); assert.sameValue(toString.call(arrIter), '[object Object]');
var map = new Map(); var map = new Map();
delete Map.prototype[Symbol.toStringTag]; delete Map.prototype[Symbol.toStringTag];
assert.sameValue(toString.call(map), defaultTag); assert.sameValue(toString.call(map), '[object Object]');
var mapIter = map[Symbol.iterator](); var mapIter = map[Symbol.iterator]();
var mapIterProto = Object.getPrototypeOf(mapIter); var mapIterProto = Object.getPrototypeOf(mapIter);
assert.sameValue(toString.call(mapIter), '[object Map Iterator]');
Object.defineProperty(mapIterProto, Symbol.toStringTag, { Object.defineProperty(mapIterProto, Symbol.toStringTag, {
get: function() { return new String('ShouldNotBeUnwrapped'); }, get: function() { return new String('ShouldNotBeUnwrapped'); },
}); });
assert.sameValue(toString.call(mapIter), defaultTag); assert.sameValue(toString.call(mapIter), '[object Object]');
var set = new Set(); var set = new Set();
delete Set.prototype[Symbol.toStringTag]; delete Set.prototype[Symbol.toStringTag];
assert.sameValue(toString.call(set), defaultTag); assert.sameValue(toString.call(set), '[object Object]');
var setIter = set[Symbol.iterator](); var setIter = set[Symbol.iterator]();
var setIterProto = Object.getPrototypeOf(setIter); var setIterProto = Object.getPrototypeOf(setIter);
assert.sameValue(toString.call(setIter), '[object Set Iterator]');
Object.defineProperty(setIterProto, Symbol.toStringTag, {value: false}); Object.defineProperty(setIterProto, Symbol.toStringTag, {value: false});
assert.sameValue(toString.call(setIter), defaultTag); assert.sameValue(toString.call(setIter), '[object Object]');
var wm = new WeakMap(); var wm = new WeakMap();
delete WeakMap.prototype[Symbol.toStringTag]; delete WeakMap.prototype[Symbol.toStringTag];
assert.sameValue(toString.call(wm), defaultTag); assert.sameValue(toString.call(wm), '[object Object]');
var ws = new WeakSet(); var ws = new WeakSet();
Object.defineProperty(WeakSet.prototype, Symbol.toStringTag, {value: 0}); Object.defineProperty(WeakSet.prototype, Symbol.toStringTag, {value: 0});
assert.sameValue(toString.call(ws), defaultTag); assert.sameValue(toString.call(ws), '[object Object]');
delete JSON[Symbol.toStringTag]; delete JSON[Symbol.toStringTag];
assert.sameValue(toString.call(JSON), defaultTag); assert.sameValue(toString.call(JSON), '[object Object]');
var gen = (function* () {})(); var gen = (function* () {})();
var genProto = Object.getPrototypeOf(gen); var genProto = Object.getPrototypeOf(gen);
Object.defineProperty(genProto, Symbol.toStringTag, { Object.defineProperty(genProto, Symbol.toStringTag, {
get: function() { return {}; }, get: function() { return {}; },
}); });
assert.sameValue(toString.call(gen), defaultTag); assert.sameValue(toString.call(gen), '[object Object]');
var promise = new Promise(function() {}); var promise = new Promise(function() {});
delete Promise.prototype[Symbol.toStringTag]; delete Promise.prototype[Symbol.toStringTag];
assert.sameValue(toString.call(promise), defaultTag); assert.sameValue(toString.call(promise), '[object Object]');