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diff --git a/testing/web-platform/tests/websockets/interfaces/WebSocket/readyState/004.html b/testing/web-platform/tests/websockets/interfaces/WebSocket/readyState/004.html
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index 000000000..fbe326a10
--- /dev/null
+++ b/testing/web-platform/tests/websockets/interfaces/WebSocket/readyState/004.html
@@ -0,0 +1,17 @@
+<!doctype html>
+<title>WebSockets: defineProperty getter for readyState</title>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=../../../constants.js?pipe=sub></script>
+<meta name="variant" content="">
+<meta name="variant" content="?wss">
+<div id=log></div>
+<script>
+test(function() {
+    Object.defineProperty(WebSocket.prototype, 'readyState', {
+        get: function() { return 'foo'; }
+    });
+    var ws = new WebSocket('ws://example.invalid/');
+    assert_equals(ws.readyState, 'foo');
+});
+</script>