1 files changed, 32 insertions, 0 deletions
diff --git a/testing/web-platform/tests/webmessaging/Channel_postMessage_with_transfer_incoming_messages.any.js b/testing/web-platform/tests/webmessaging/Channel_postMessage_with_transfer_incoming_messages.any.js
new file mode 100644
index 0000000000..fe2e96220d
--- /dev/null
+++ b/testing/web-platform/tests/webmessaging/Channel_postMessage_with_transfer_incoming_messages.any.js
@@ -0,0 +1,32 @@
+async_test(function(t) {
+  var channel1 = new MessageChannel();
+  var channel2 = new MessageChannel();
+  var channel3 = new MessageChannel();
+  channel2.port2.onmessage = t.step_func(function (evt) {
+    channel3.port1.onmessage = t.step_func(function (evt) {
+      var counter = 0;
+      evt.ports[0].onmessage = t.step_func(function (evt) {
+        if (counter == 0) {
+          assert_equals(evt.data, "First");
+          counter = 1;
+        } else if (counter == 1) {
+          assert_equals(evt.data, "Second");
+          counter = 2;
+        } else if (counter == 2) {
+          assert_equals(evt.data, "Third");
+          counter = 3;
+        } else if (counter == 3) {
+          assert_equals(evt.data, "Fourth");
+          t.done();
+        }
+      });
+      channel1.port2.postMessage("Fourth");
+    });
+    channel1.port2.postMessage("Second");
+    channel1.port2.postMessage("Third");
+    channel3.port2.postMessage("2", evt.ports);
+  });
+  channel1.port2.postMessage("First");
+  channel2.port1.postMessage("1", [channel1.port1]);
+}, `When transferring a non-enabled port mutiple times,
+    incoming messages sent at various transfer steps are received in order upon enablement.`);