| <!DOCTYPE html> |
| <script src="../../resources/testharness.js"></script> |
| <script src="../../resources/testharnessreport.js"></script> |
| <script type="module"> |
| |
| // Keep FinalizationRegistry global to avoid it being reclaimed by garbage |
| // collections that may happen until the registry is processed in microtasks. |
| let fr; |
| |
| async_test(t => { |
| let called = false; |
| const callback = t.step_func_done(function(holdings) { |
| called = true; |
| assert_equals(holdings, 'holdings', |
| 'holdings should be initialized correctly'); |
| }); |
| |
| fr = new FinalizationRegistry(callback); |
| |
| // The following is an IIFE to ensure that garbage becomes unreachable after |
| // the function returns. |
| (function() { |
| let garbage = {}; |
| fr.register(garbage, 'holdings'); |
| garbage = null; |
| })(); |
| |
| assert_false(called, 'finalizer should not be called in the same turn'); |
| |
| gc(); |
| |
| assert_false(called, 'finalizer should not be called in the same turn'); |
| |
| }, 'FinalizationRegistry registers an object and calls finalizer'); |
| </script> |
