From 22e7b0f585fb3715ef1894b2c26a0e3cbbd43e9e Mon Sep 17 00:00:00 2001
From: Luca Casonato <hello@lcas.dev>
Date: Sat, 26 Jun 2021 11:17:05 +0200
Subject: fix: MessagePort in message for postMessage transfers (#11103)

---
 cli/tests/unit/message_channel_test.ts | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

(limited to 'cli')

diff --git a/cli/tests/unit/message_channel_test.ts b/cli/tests/unit/message_channel_test.ts
index 0cb2671d5..2c6062658 100644
--- a/cli/tests/unit/message_channel_test.ts
+++ b/cli/tests/unit/message_channel_test.ts
@@ -31,3 +31,29 @@ Deno.test("messagechannel", async () => {
   mc.port2.close();
   mc2.port2.close();
 });
+
+Deno.test("messagechannel clone port", async () => {
+  const mc = new MessageChannel();
+  const mc2 = new MessageChannel();
+  assert(mc.port1);
+  assert(mc.port2);
+
+  const promise = deferred();
+
+  mc.port2.onmessage = (e) => {
+    const { port } = e.data;
+    assertEquals(e.ports.length, 1);
+    assert(e.ports[0] instanceof MessagePort);
+    assertEquals(e.ports[0], port);
+    e.ports[0].close();
+    promise.resolve();
+  };
+
+  mc.port1.postMessage({ port: mc2.port1 }, [mc2.port1]);
+  mc.port1.close();
+
+  await promise;
+
+  mc.port2.close();
+  mc2.port2.close();
+});
-- 
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