3 files changed, 9 insertions, 16 deletions
diff --git a/cli/tests/testdata/worker_message_before_close.js b/cli/tests/testdata/worker_message_before_close.js
index 8ad35b3fc..13ca6c9c7 100644
--- a/cli/tests/testdata/worker_message_before_close.js
+++ b/cli/tests/testdata/worker_message_before_close.js
@@ -1,4 +1,4 @@
-let messagesReceived = 0;
+const messagesReceived = new Set();
 
 for (let i = 0; i < 4; i++) {
   const worker = new Worker(
@@ -7,21 +7,20 @@ for (let i = 0; i < 4; i++) {
   );
 
   worker.addEventListener("message", () => {
-    messagesReceived += 1;
-
-    if (messagesReceived == 4) {
+    messagesReceived.add(i);
+    if (messagesReceived.size == 4) {
       console.log("received all 4 responses from the workers");
     }
   });
 
-  worker.postMessage(i);
+  worker.postMessage({});
 }
 
 globalThis.addEventListener("unload", () => {
-  if (messagesReceived !== 4) {
+  if (messagesReceived.size !== 4) {
     console.log(
       "received only %d responses from the workers",
-      messagesReceived,
+      messagesReceived.size,
     );
   }
 });
diff --git a/cli/tests/testdata/worker_message_before_close.js.out b/cli/tests/testdata/worker_message_before_close.js.out
index 02a50ea95..f91b7b4cb 100644
--- a/cli/tests/testdata/worker_message_before_close.js.out
+++ b/cli/tests/testdata/worker_message_before_close.js.out
@@ -1,5 +1 @@
-message received in worker 0
-message received in worker 1
-message received in worker 2
-message received in worker 3
 received all 4 responses from the workers
diff --git a/cli/tests/testdata/workers/message_before_close.js b/cli/tests/testdata/workers/message_before_close.js
index 0213abcb3..9364b6d82 100644
--- a/cli/tests/testdata/workers/message_before_close.js
+++ b/cli/tests/testdata/workers/message_before_close.js
@@ -1,6 +1,4 @@
-self.onmessage = (params) => {
-  const workerId = params.data;
-  console.log("message received in worker %d", workerId);
-  self.postMessage(workerId);
-  self.close();
+onmessage = () => {
+  postMessage({});
+  close();
 };