diff --git a/1-js/06-advanced-functions/09-call-apply-decorators/04-throttle/_js.view/test.js b/1-js/06-advanced-functions/09-call-apply-decorators/04-throttle/_js.view/test.js
index 5339c8d1..d2cf8e15 100644
--- a/1-js/06-advanced-functions/09-call-apply-decorators/04-throttle/_js.view/test.js
+++ b/1-js/06-advanced-functions/09-call-apply-decorators/04-throttle/_js.view/test.js
@@ -44,4 +44,20 @@ describe("throttle(f, 1000)", function() {
     this.clock.restore();
   });
 
-});
\ No newline at end of file
+});
+
+describe('throttle', () => {
+
+  it('runs a forwarded call once', done => {
+    let log = '';
+    const f = str => log += str;
+    const f10 = throttle(f, 10);
+    f10('once');
+
+    setTimeout(() => {
+      assert.equal(log, 'once');
+      done();
+    }, 20);
+  });
+
+});