test: use mustCall() in pummel test

Replace 'exit' check with common.mustCall(). PR-URL: #34327 Reviewed-By: Anna Henningsen <[email protected]> Reviewed-By: Michaël Zasso <[email protected]> Reviewed-By: Luigi Pinca <[email protected]> Reviewed-By: James M Snell <[email protected]>

Author: Trott

test/pummel/test-net-connect-econnrefused.js

@@ -48,17 +48,14 @@ function pummel(){
 }
 
 functioncheck(){
-setTimeout(function(){
+setTimeout(common.mustCall(function(){
 assert.strictEqual(process._getActiveRequests().length,0);
 constactiveHandles=process._getActiveHandles();
 assert.ok(activeHandles.every((val)=>val.constructor.name!=='Socket'));
-check_called=true;
-},0);
+}),0);
 }
-letcheck_called=false;
 
 process.on('exit',function(){
 assert.strictEqual(rounds,ROUNDS);
 assert.strictEqual(reqs,ROUNDS*ATTEMPTS_PER_ROUND);
-assert(check_called);
 });