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 <[email protected]>
Reviewed-By: Luigi Pinca <[email protected]>

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.
+
+const common = require('../common');
+common.skipIfWorker();
+
+const assert = require('assert');
+
+const { Worker, isMainThread } = require('worker_threads');
+if (isMainThread) {
+  const worker = new Worker(__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');
+  const messagePort = getEnvMessagePort();
+  messagePort.postMessage({ type: messageTypes.COULD_NOT_SERIALIZE_ERROR });
+}