test: use existing gc utilities

test/parallel/test-abortsignal-drop-settled-signals.mjs

@@ -1,26 +1,9 @@
 // Flags: --expose_gc
 //
 import '../common/index.mjs';
+import { gcUntil } from '../common/gc.js';
 import { describe, it } from 'node:test';
 
-function repeatSetImmediateAndGC(times, callback) {
-  let count = 0;
-
-  function next() {
-    if (count < times) {
-      count++;
-      setImmediate(() => {
-        global.gc();
-        next();
-      });
-    } else if (callback) {
-      callback();
-    }
-  }
-
-  next();
-}
-
 function makeSubsequentCalls(limit, done, holdReferences = false) {
   let dependantSymbol;
   let signalRef;
@@ -175,12 +158,13 @@ it('drops settled dependant signals when signal is composite', (t, done) => {
 });
 
 it('drops settled signals even when there are listeners', (t, done) => {
-  runWithOrphanListeners(limit, (signalRefs) => {
-    repeatSetImmediateAndGC(3, () => {
+  runWithOrphanListeners(limit, async (signalRefs) => {
+    await gcUntil('all signals are GCed', () => {
       const unGCedSignals = [...signalRefs].filter((ref) => ref.deref());
 
-      t.assert.strictEqual(unGCedSignals.length, 0);
-      done();
+      return unGCedSignals.length === 0;
     });
+
+    done();
   });
 });