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diff --git a/devtools/client/webconsole/test/browser/test-closure-optimized-out.html b/devtools/client/webconsole/test/browser/test-closure-optimized-out.html
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+++ b/devtools/client/webconsole/test/browser/test-closure-optimized-out.html
@@ -0,0 +1,34 @@
+<!DOCTYPE HTML>
+<html>
+  <head>
+    <meta charset='utf-8'/>
+    <title>Debugger Test for Inspecting Optimized-Out Variables</title>
+    <!-- Any copyright is dedicated to the Public Domain.
+         http://creativecommons.org/publicdomain/zero/1.0/ -->
+    <script type="text/javascript">
+        /* eslint-disable */
+        window.addEventListener("load", function () {
+        function clickHandler(event) {
+          button.removeEventListener("click", clickHandler);
+          function outer(arg) {
+            let upvar = arg * 2;
+            // The inner lambda only aliases arg, so the frontend alias analysis decides
+            // that upvar is not aliased and is not in the CallObject.
+            return function () {
+              arg += 2;
+            };
+          }
+
+          let f = outer(42);
+          f();
+        }
+        let button = document.querySelector("button");
+        button.addEventListener("click", clickHandler);
+      }, {once: true});
+    </script>
+
+  </head>
+  <body>
+    <button>Click me!</button>
+  </body>
+</html>