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-rw-r--r--testing/web-platform/tests/webmessaging/with-options/one-arg.html13
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diff --git a/testing/web-platform/tests/webmessaging/with-options/one-arg.html b/testing/web-platform/tests/webmessaging/with-options/one-arg.html
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+++ b/testing/web-platform/tests/webmessaging/with-options/one-arg.html
@@ -0,0 +1,13 @@
+<!doctype html>
+<title>just one argument</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<div id="log"></div>
+<script>
+async_test(t => {
+ postMessage('');
+ onmessage = t.step_func_done(e => {
+ assert_equals(e.data, '');
+ });
+});
+</script>