return-undefined-with-gc.optional.any.js

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This test has a WPT meta file that expects 1 subtest issues.
This WPT test may be referenced by the following Test IDs:
- /js/builtins/weakrefs/return-undefined-with-gc.optional.any.html - WPT Dashboard Interop Dashboard
- /js/builtins/weakrefs/return-undefined-with-gc.optional.any.worker.html - WPT Dashboard Interop Dashboard

// META: script=/common/gc.js

// META: script=resources/maybe-garbage-collect.js

// ├──> maybeGarbageCollectAndCleanupAsync

// └──> resolveGarbageCollection

/*---

esid: sec-finalization-registry.prototype.cleanupSome

info: |

  FinalizationRegistry.prototype.cleanupSome ( [ callback ] )

  1. Let finalizationRegistry be the this value.

  2. If Type(finalizationRegistry) is not Object, throw a TypeError exception.

  3. If finalizationRegistry does not have a [[Cells]] internal slot, throw a TypeError exception.

  4. If callback is not undefined and IsCallable(callback) is false, throw a TypeError exception.

  5. Perform ? CleanupFinalizationRegistry(finalizationRegistry, callback).

  6. Return undefined.

---*/

let called;

let fn = function() {

  called += 1;

  return 39;

};

let cb = function() {

  called += 1;

  return 42;

};

let finalizationRegistry = new FinalizationRegistry(fn);

function emptyCells() {

  let target = {};

  finalizationRegistry.register(target);

  let prom = maybeGarbageCollectAndCleanupAsync(target);

  target = null;

  return prom;

promise_test(() => {

  return (async () => {

    assert_implements(

      typeof FinalizationRegistry.prototype.cleanupSome === 'function',

      'FinalizationRegistry.prototype.cleanupSome is not implemented.'

);

    await emptyCells();

    called = 0;

    assert_equals(finalizationRegistry.cleanupSome(cb), undefined, 'regular callback');

    assert_equals(called, 1);

    await emptyCells();

    called = 0;

    assert_equals(finalizationRegistry.cleanupSome(fn), undefined, 'regular callback, same FG cleanup function');

    assert_equals(called, 1);

    await emptyCells();

    called = 0;

    assert_equals(finalizationRegistry.cleanupSome(), undefined, 'undefined (implicit) callback, defer to FB callback');

    assert_equals(called, 1);

    await emptyCells();

    called = 0;

    assert_equals(finalizationRegistry.cleanupSome(undefined), undefined, 'undefined (explicit) callback, defer to FB callback');

    assert_equals(called, 1);

    await emptyCells();

    assert_equals(finalizationRegistry.cleanupSome(() => 1), undefined, 'arrow function');

    await emptyCells();

    assert_equals(finalizationRegistry.cleanupSome(async function() {}), undefined, 'async function');

    await emptyCells();

    assert_equals(finalizationRegistry.cleanupSome(function *() {}), undefined, 'generator');

    await emptyCells();

    assert_equals(finalizationRegistry.cleanupSome(async function *() {}), undefined, 'async generator');

  })().catch(resolveGarbageCollection);

}, 'Return undefined regardless the result of CleanupFinalizationRegistry');