test: add coverage for unserializable worker thread error

Check that the main thread handles unserializable errors in a worker
thread as expected.
PR-URL: #27995
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>

Author: Trott

test/parallel/test-worker-message-not-serializable.js

@@ -0,0 +1,25 @@
+'use strict';
+
+// Flags: --expose-internals
+
+// Check that main thread handles unserializable errors in a worker thread as
+// expected.
+
+constcommon=require('../common');
+common.skipIfWorker();
+
+constassert=require('assert');
+
+const{ Worker, isMainThread }=require('worker_threads');
+if(isMainThread){
+constworker=newWorker(__filename);
+worker.on('error',common.mustCall((e)=>{
+assert.strictEqual(e.code,'ERR_WORKER_UNSERIALIZABLE_ERROR');
+}));
+}else{
+const{ internalBinding }=require('internal/test/binding');
+const{ getEnvMessagePort }=internalBinding('worker');
+const{ messageTypes }=require('internal/worker/io');
+constmessagePort=getEnvMessagePort();
+messagePort.postMessage({type: messageTypes.COULD_NOT_SERIALIZE_ERROR});
+}