1 files changed, 36 insertions, 0 deletions
diff --git a/testing/web-platform/tests/webmessaging/Channel_postMessage_with_transfer_entangled.any.js b/testing/web-platform/tests/webmessaging/Channel_postMessage_with_transfer_entangled.any.js
new file mode 100644
index 0000000000..2226b27844
--- /dev/null
+++ b/testing/web-platform/tests/webmessaging/Channel_postMessage_with_transfer_entangled.any.js
@@ -0,0 +1,36 @@
+async_test(function(t) {
+    var channel1 = new MessageChannel();
+    var channel2 = new MessageChannel();
+
+     // One, send a message.
+     channel1.port1.postMessage(1);
+
+     // Two, transfer both ports.
+     channel2.port1.postMessage("transfer", [channel1.port1]);
+     channel2.port1.postMessage("transfer", [channel1.port2]);
+
+     var transfer_counter = 0;
+     var sender;
+     channel2.port2.onmessage = t.step_func(function (evt) {
+         if (transfer_counter == 0) {
+             sender = evt.ports[0];
+             transfer_counter = 1;
+         } else {
+             sender.postMessage(2);
+             var counter = 0;
+             evt.ports[0].onmessage = t.step_func(function (evt) {
+                 if (counter == 0) {
+                     assert_equals(evt.data, 1);
+                     counter = 1;
+                 } else if (counter == 1) {
+                     assert_equals(evt.data, 2);
+                     counter = 2;
+                 } else {
+                     assert_equals(evt.data, 3);
+                     t.done();
+                 }
+             });
+             sender.postMessage(3);
+         }
+      });
+}, "An entangled port transferred to the same origin receives messages in order");