test: handle unknown message type in worker threads

Check that main thread handles an unknown message type from 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

@@ -6,20 +6,19 @@
 // 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{ Worker }=require('worker_threads');
+
+constworker=newWorker(`
  const { internalBinding } = require('internal/test/binding');
  const { getEnvMessagePort } = internalBinding('worker');
  const { messageTypes } = require('internal/worker/io');
  const messagePort = getEnvMessagePort();
  messagePort.postMessage({ type: messageTypes.COULD_NOT_SERIALIZE_ERROR });
-}
+`,{eval: true});
+
+worker.on('error',common.mustCall((e)=>{
+assert.strictEqual(e.code,'ERR_WORKER_UNSERIALIZABLE_ERROR');
+}));

test/parallel/test-worker-message-type-unknown.js

@@ -0,0 +1,25 @@
+'use strict';
+
+// Check that main thread handles an unknown message type from a worker thread
+// as expected.
+
+require('../common');
+
+constassert=require('assert');
+const{ spawnSync }=require('child_process');
+
+const{ Worker }=require('worker_threads');
+if(process.argv[2]!=='spawned'){
+constresult=spawnSync(process.execPath,
+['--expose-internals',__filename,'spawned'],
+{encoding: 'utf8'});
+assert.ok(result.stderr.includes('Unknown worker message type FHQWHGADS'),
+`Expected error not found in: ${result.stderr}`);
+}else{
+newWorker(`
+ const { internalBinding } = require('internal/test/binding');
+ const { getEnvMessagePort } = internalBinding('worker');
+ const messagePort = getEnvMessagePort();
+ messagePort.postMessage({ type: 'FHQWHGADS' });
+ `,{eval: true});
+}