fix regular mode 2

Author: DenysKuchma

lib/command/workers/runTests.js

@@ -213,10 +213,18 @@ initPromise = (async function () {
     } else if (mocha.suite.total()) {
       await runTests()
       await new Promise(resolve => setTimeout(resolve, 100))
+      // Remove message listener before closing to prevent event loop hanging
+      if (global.parentMessageHandler) {
+        parentPort?.off('message', global.parentMessageHandler)
+      }
       parentPort?.close()
     } else {
       // No tests to run, close the worker
       console.error(`[Worker ${workerIndex}] ERROR: No tests found after filtering! Assigned ${tests.length} UIDs but none matched.`)
+      // Remove message listener before closing to prevent event loop hanging
+      if (global.parentMessageHandler) {
+        parentPort?.off('message', global.parentMessageHandler)
+      }
       parentPort?.close()
     }
   } catch (err) {
@@ -560,9 +568,11 @@ function sendToParentThread(data) {
 
 function listenToParentThread() {
   if (!poolMode) {
-    parentPort?.on('message', eventData => {
+    const messageHandler = eventData => {
       container.append({ support: eventData.data })
-    })
+    }
+    parentPort?.on('message', messageHandler)
+    global.parentMessageHandler = messageHandler
   }
   // In pool mode, message handling is done in runPoolTests()
 }