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QUnit.test('WeakSet#deleteAll', assert => {
const { deleteAll } = WeakSet.prototype;
assert.isFunction(deleteAll);
assert.arity(deleteAll, 0);
assert.name(deleteAll, 'deleteAll');
assert.looksNative(deleteAll);
assert.nonEnumerable(WeakSet.prototype, 'deleteAll');
const a = [];
const b = [];
const c = [];
const d = [];
const e = [];
let set = new WeakSet([a, b, c]);
assert.true(set.deleteAll(a, b));
assert.false(set.has(a));
assert.false(set.has(b));
assert.true(set.has(c));
assert.false(set.has(d));
assert.false(set.has(e));
set = new WeakSet([a, b, c]);
assert.false(set.deleteAll(c, d));
assert.true(set.has(a));
assert.true(set.has(b));
assert.false(set.has(c));
assert.false(set.has(d));
assert.false(set.has(e));
set = new WeakSet([a, b, c]);
assert.false(set.deleteAll(d, e));
assert.true(set.has(a));
assert.true(set.has(b));
assert.true(set.has(c));
assert.false(set.has(d));
assert.false(set.has(e));
set = new WeakSet([a, b, c]);
assert.true(set.deleteAll());
assert.true(set.has(a));
assert.true(set.has(b));
assert.true(set.has(c));
assert.false(set.has(d));
assert.false(set.has(e));
assert.throws(() => deleteAll.call({ delete() { /* empty */ } }, a, b, c));
assert.throws(() => deleteAll.call({}, a, b, c), TypeError);
assert.throws(() => deleteAll.call(undefined, a, b, c), TypeError);
assert.throws(() => deleteAll.call(null, a, b, c), TypeError);
});
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