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es.weak-set.js
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es.weak-set.js
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import { DESCRIPTORS, GLOBAL, NATIVE } from '../helpers/constants';
import { createIterable, nativeSubclass } from '../helpers/helpers';
const Symbol = GLOBAL.Symbol || {};
const { freeze, keys, getOwnPropertyNames, getOwnPropertySymbols } = Object;
const { ownKeys } = GLOBAL.Reflect || {};
QUnit.test('WeakSet', assert => {
assert.isFunction(WeakSet);
assert.name(WeakSet, 'WeakSet');
assert.arity(WeakSet, 0);
assert.looksNative(WeakSet);
assert.true('add' in WeakSet.prototype, 'add in WeakSet.prototype');
assert.true('delete' in WeakSet.prototype, 'delete in WeakSet.prototype');
assert.true('has' in WeakSet.prototype, 'has in WeakSet.prototype');
assert.true(new WeakSet() instanceof WeakSet, 'new WeakSet instanceof WeakSet');
let object = {};
assert.true(new WeakSet(createIterable([object])).has(object), 'Init from iterable');
const weakset = new WeakSet();
const frozen = freeze({});
weakset.add(frozen);
assert.true(weakset.has(frozen), 'works with frozen objects, #1');
weakset.delete(frozen);
assert.false(weakset.has(frozen), 'works with frozen objects, #2');
let done = false;
try {
new WeakSet(createIterable([null, 1, 2], {
return() {
return done = true;
},
}));
} catch { /* empty */ }
assert.true(done, '.return #throw');
assert.false(('clear' in WeakSet.prototype), 'should not contains `.clear` method');
const array = [];
done = false;
array['@@iterator'] = undefined;
array[Symbol.iterator] = function () {
done = true;
return [][Symbol.iterator].call(this);
};
new WeakSet(array);
assert.true(done);
object = {};
new WeakSet().add(object);
if (DESCRIPTORS) {
const results = [];
for (const key in object) results.push(key);
assert.arrayEqual(results, []);
assert.arrayEqual(keys(object), []);
}
assert.arrayEqual(getOwnPropertyNames(object), []);
if (getOwnPropertySymbols) assert.arrayEqual(getOwnPropertySymbols(object), []);
if (ownKeys) assert.arrayEqual(ownKeys(object), []);
if (nativeSubclass) {
const Subclass = nativeSubclass(WeakSet);
assert.true(new Subclass() instanceof Subclass, 'correct subclassing with native classes #1');
assert.true(new Subclass() instanceof WeakSet, 'correct subclassing with native classes #2');
object = {};
assert.true(new Subclass().add(object).has(object), 'correct subclassing with native classes #3');
}
const buffer = new ArrayBuffer(8);
const set = new WeakSet([buffer]);
assert.true(set.has(buffer), 'works with ArrayBuffer keys');
});
QUnit.test('WeakSet#add', assert => {
assert.isFunction(WeakSet.prototype.add);
assert.name(WeakSet.prototype.add, 'add');
assert.arity(WeakSet.prototype.add, 1);
assert.looksNative(WeakSet.prototype.add);
assert.nonEnumerable(WeakSet.prototype, 'add');
const weakset = new WeakSet();
assert.same(weakset.add({}), weakset, 'chaining');
assert.throws(() => new WeakSet().add(42), 'throws with primitive keys');
});
QUnit.test('WeakSet#delete', assert => {
assert.isFunction(WeakSet.prototype.delete);
if (NATIVE) assert.arity(WeakSet.prototype.delete, 1);
assert.looksNative(WeakSet.prototype.delete);
assert.nonEnumerable(WeakSet.prototype, 'delete');
const a = {};
const b = {};
const weakset = new WeakSet().add(a).add(b);
assert.true(weakset.has(a), 'WeakSet has values before .delete() #1');
assert.true(weakset.has(b), 'WeakSet has values before .delete() #2');
weakset.delete(a);
assert.false(weakset.has(a), 'WeakSet has not value after .delete() #1');
assert.true(weakset.has(b), 'WeakSet has not value after .delete() #2');
assert.notThrows(() => !weakset.delete(1), 'return false on primitive');
});
QUnit.test('WeakSet#has', assert => {
assert.isFunction(WeakSet.prototype.has);
assert.name(WeakSet.prototype.has, 'has');
assert.arity(WeakSet.prototype.has, 1);
assert.looksNative(WeakSet.prototype.has);
assert.nonEnumerable(WeakSet.prototype, 'has');
const weakset = new WeakSet();
assert.false(weakset.has({}), 'WeakSet has`nt value');
const object = {};
weakset.add(object);
assert.true(weakset.has(object), 'WeakSet has value after .add()');
weakset.delete(object);
assert.false(weakset.has(object), 'WeakSet has not value after .delete()');
assert.notThrows(() => !weakset.has(1), 'return false on primitive');
});
QUnit.test('WeakSet::@@toStringTag', assert => {
assert.same(WeakSet.prototype[Symbol.toStringTag], 'WeakSet', 'WeakSet::@@toStringTag is `WeakSet`');
assert.same(String(new WeakSet()), '[object WeakSet]', 'correct stringification');
});