test: add a request-response test for MessageChannel

This commit adds a request-response test for MessageChannel.

PR-URL: #21514
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>

test/parallel/test-message-port.js

@@ -18,6 +18,21 @@ const { MessageChannel, MessagePort } = require('worker_threads');
   }));
 }
 
+{
+  const { port1, port2 } = new MessageChannel();
+
+  port1.onmessage = common.mustCall((message) => {
+    assert.strictEqual(message, 4);
+    port2.close(common.mustCall());
+  });
+
+  port1.postMessage(2);
+
+  port2.onmessage = common.mustCall((message) => {
+    port2.postMessage(message * 2);
+  });
+}
+
 {
   const { port1, port2 } = new MessageChannel();