test: add GC test for disabled AsyncLocalStorage

test/async-hooks/test-async-local-storage-gcable.js

@@ -0,0 +1,20 @@
+'use strict';
+// Flags: --expose_gc
+
+// This test ensures that AsyncLocalStorage gets gced once it was disabled
+// and no strong references remain in userland.
+
+const common = require('../common');
+const { AsyncLocalStorage } = require('async_hooks');
+const onGC = require('../common/ongc');
+
+let asyncLocalStorage = new AsyncLocalStorage();
+
+asyncLocalStorage.runSyncAndReturn({}, () => {
+  asyncLocalStorage.disable();
+
+  onGC(asyncLocalStorage, { ongc: common.mustCall() });
+});
+
+asyncLocalStorage = null;
+global.gc();