ad logging

test/worker.js

@@ -1,7 +1,10 @@
 onconnect = function (event) {
+  console.log('worker loaded');
+
   const port = event.ports[0];
 
   port.onmessage = function (e) {
+    console.log('worker message received');
     const workerResult = `Result: ${e.data[0] * e.data[1]}`;
     port.postMessage(workerResult);
   };