1 files changed, 38 insertions, 1 deletions
diff --git a/bench/snippets/emitter.js b/bench/snippets/emitter.js
index 4b6b8b216..0dacf18ac 100644
--- a/bench/snippets/emitter.js
+++ b/bench/snippets/emitter.js
@@ -16,18 +16,55 @@ bench("EventEmitter.emit", () => {
   });
 });
 
+var monkey = Object.assign({}, EventEmitter.prototype);
+monkey.on("hello", (event) => {
+  event.preventDefault();
+});
+
+bench("[monkey] EventEmitter.emit", () => {
+  var called = false;
+  monkey.emit("hello", {
+    preventDefault() {
+      id++;
+      called = true;
+    },
+  });
+
+  if (!called) {
+    throw new Error("monkey failed");
+  }
+});
+
 bench("EventEmitter.on x 10_000 (handler)", () => {
-  var cb = () => {
+  var cb = (event) => {
     event.preventDefault();
   };
   emitter.on("hey", cb);
+  var called = false;
   for (let i = 0; i < 10_000; i++)
     emitter.emit("hey", {
       preventDefault() {
         id++;
+        called = true;
       },
     });
   emitter.off("hey", cb);
+
+  if (!called) throw new Error("not called");
+});
+
+bench("[monkey] EventEmitter.on x 10_000 (handler)", () => {
+  var cb = () => {
+    event.preventDefault();
+  };
+  monkey.on("hey", cb);
+  for (let i = 0; i < 10_000; i++)
+    monkey.emit("hey", {
+      preventDefault() {
+        id++;
+      },
+    });
+  monkey.off("hey", cb);
 });
 
 var target = new EventTarget();