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-rw-r--r--testing/web-platform/tests/webmessaging/message-channels/implied-start.any.js14
1 files changed, 14 insertions, 0 deletions
diff --git a/testing/web-platform/tests/webmessaging/message-channels/implied-start.any.js b/testing/web-platform/tests/webmessaging/message-channels/implied-start.any.js
new file mode 100644
index 0000000000..460d26b7e4
--- /dev/null
+++ b/testing/web-platform/tests/webmessaging/message-channels/implied-start.any.js
@@ -0,0 +1,14 @@
+// META: title=onmessage implied start()
+
+async_test(function(t) {
+ var channel = new MessageChannel();
+ channel.port1.postMessage(1);
+ channel.port2.onmessage = function() {
+ setTimeout(t.step_func(function() {
+ t.done();
+ }), 50);
+ channel.port2.onmessage = t.step_func(function() {
+ assert_unreached();
+ });
+ }; // implies start()
+});