1 files changed, 35 insertions, 0 deletions
diff --git a/testing/web-platform/tests/webmessaging/Channel_postMessage_with_transfer_outgoing_messages.any.js b/testing/web-platform/tests/webmessaging/Channel_postMessage_with_transfer_outgoing_messages.any.js
new file mode 100644
index 0000000000..aa80b7589c
--- /dev/null
+++ b/testing/web-platform/tests/webmessaging/Channel_postMessage_with_transfer_outgoing_messages.any.js
@@ -0,0 +1,35 @@
+
+async_test(function(t) {
+  var channel1 = new MessageChannel();
+  var channel2 = new MessageChannel();
+  var channel3 = new MessageChannel();
+  channel2.port2.onmessage = t.step_func(function (evt) {
+    evt.ports[0].postMessage("Second");
+    evt.ports[0].postMessage("Third");
+    channel3.port1.onmessage = t.step_func(function (evt) {
+      evt.ports[0].postMessage("Fourth");
+    });
+    channel3.port2.postMessage("2", evt.ports);
+  });
+  channel1.port1.postMessage("First");
+  channel2.port1.postMessage("1", [channel1.port1]);
+  var counter = 0;
+  channel1.port2.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();
+    }
+  });
+}, `When transferring a port,
+    outgoing messages sent at each transfer step are received in order by the entangled port.`);