1 files changed, 28 insertions, 0 deletions
diff --git a/testing/web-platform/tests/websockets/interfaces/WebSocket/send/006.html b/testing/web-platform/tests/websockets/interfaces/WebSocket/send/006.html
new file mode 100644
index 0000000000..4095c0ba6b
--- /dev/null
+++ b/testing/web-platform/tests/websockets/interfaces/WebSocket/send/006.html
@@ -0,0 +1,28 @@
+<!doctype html>
+<title>WebSockets: send() with unpaired surrogate when readyState is OPEN</title>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=../../../constants.sub.js></script>
+<meta name="variant" content="?default">
+<meta name="variant" content="?wss">
+<meta name="variant" content="?wpt_flags=h2">
+<div id="log"></div>
+<script>
+async_test(function(t) {
+  var ws = new WebSocket(SCHEME_DOMAIN_PORT+'/echo');
+  ws.onopen = t.step_func(function(e) {
+    // lone low surrogate, lone high surrogate + surrogates in wrong order.
+    ws.send('a\uDC00xb\uD800xc\uDC00\uD800x');
+  })
+  ws.onmessage = t.step_func(function(e) {
+    assert_equals(e.data, 'a\uFFFDxb\uFFFDxc\uFFFD\uFFFDx');
+    ws.onclose = t.step_func(function(e) {
+      ws.onclose = t.unreached_func();
+      t.step_timeout(() => t.done(), 50);
+    });
+    ws.close();
+  })
+  // This will be overridden if the message event fires.
+  ws.onclose = t.unreached_func('close event should not fire before message event');
+ });
+</script>