cleanup-prevented-with-unregister.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/cleanup-prevented-with-unregister.optional.any.html - WPT Dashboard Interop Dashboard
- /js/builtins/weakrefs/cleanup-prevented-with-unregister.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.

  FinalizationRegistry.prototype.unregister ( unregisterToken )

  1. Let removed be false.

  2. For each Record { [[Target]], [[Holdings]], [[UnregisterToken]] } cell that is an element of finalizationRegistry.[[Cells]], do

    a. If SameValue(cell.[[UnregisterToken]], unregisterToken) is true, then

      i. Remove cell from finalizationRegistry.[[Cells]].

      ii. Set removed to true.

  3. Return removed.

---*/

let token = {};

let finalizationRegistry = new FinalizationRegistry(function() {});

function emptyCells() {

  let target = {};

  finalizationRegistry.register(target, 'target!', token);

  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();

    let called = 0;

    let res = finalizationRegistry.unregister(token);

    assert_equals(res, true, 'unregister target before iterating over it in cleanup');

    finalizationRegistry.cleanupSome((holding) => {

      called += 1;

});

    assert_equals(called, 0, 'callback was not called');

  })().catch(resolveGarbageCollection);

}, 'Cleanup might be prevented with an unregister usage');