1 files changed, 41 insertions, 0 deletions
diff --git a/js/src/devtools/gc-ubench/benchmarks/expandoEvents.js b/js/src/devtools/gc-ubench/benchmarks/expandoEvents.js
new file mode 100644
index 0000000000..4c6a53c8fe
--- /dev/null
+++ b/js/src/devtools/gc-ubench/benchmarks/expandoEvents.js
@@ -0,0 +1,41 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+tests.set(
+  "expandoEvents",
+  (function() {
+    var garbage = [];
+    var garbageIndex = 0;
+    return {
+      description: "var foo = [ textNode, textNode, ... ]",
+
+      enabled: "document" in globalThis,
+
+      load: N => {
+        garbage = new Array(N);
+      },
+      unload: () => {
+        garbage = [];
+        garbageIndex = 0;
+      },
+
+      defaultGarbagePerFrame: "100K",
+      defaultGarbagePiles: "8",
+
+      makeGarbage: N => {
+        var a = [];
+        for (var i = 0; i < N; i++) {
+          var e = document.createEvent("Events");
+          e.initEvent("TestEvent", true, true);
+          e.color = ["tuna"];
+          a.push(e);
+        }
+        garbage[garbageIndex++] = a;
+        if (garbageIndex == garbage.length) {
+          garbageIndex = 0;
+        }
+      },
+    };
+  })()
+);