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QUnit.test('WeakMap#upsert', assert => {
const { upsert } = WeakMap.prototype;
assert.isFunction(upsert);
assert.arity(upsert, 2);
assert.looksNative(upsert);
assert.nonEnumerable(WeakMap.prototype, 'upsert');
const a = {};
const b = {};
const map = new WeakMap([[a, 2]]);
assert.same(map.upsert(a, function (value) {
assert.same(arguments.length, 1, 'correct number of callback arguments');
assert.same(value, 2, 'correct value in callback');
return value ** 2;
}, () => {
assert.avoid();
return 3;
}), 4, 'returns a correct value');
assert.same(map.upsert(b, value => {
assert.avoid();
return value ** 2;
}, function () {
assert.same(arguments.length, 0, 'correct number of callback arguments');
return 3;
}), 3, 'returns a correct value');
assert.same(map.get(a), 4, 'correct result #1');
assert.same(map.get(b), 3, 'correct result #2');
assert.same(new WeakMap([[a, 2]]).upsert(b, null, () => 3), 3);
assert.same(new WeakMap([[a, 2]]).upsert(a, value => value ** 2), 4);
assert.throws(() => new WeakMap().upsert(a), TypeError);
assert.throws(() => upsert.call({}, a, () => { /* empty */ }, () => { /* empty */ }), TypeError);
assert.throws(() => upsert.call([], a, () => { /* empty */ }, () => { /* empty */ }), TypeError);
assert.throws(() => upsert.call(undefined, a, () => { /* empty */ }, () => { /* empty */ }), TypeError);
assert.throws(() => upsert.call(null, a, () => { /* empty */ }, () => { /* empty */ }), TypeError);
});
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