From 0c3d8a4b1bdb57426b0998b993daaedde6923da6 Mon Sep 17 00:00:00 2001
From: Rene Haas <king-sora@hotmail.de>
Date: Tue, 25 Oct 2022 22:33:43 +0200
Subject: [PATCH] improve event listener test

---
 .../test/jest-jsdom/overlayscrollbars.test.ts          | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/packages/overlayscrollbars/test/jest-jsdom/overlayscrollbars.test.ts b/packages/overlayscrollbars/test/jest-jsdom/overlayscrollbars.test.ts
index 9ba9457..ef6c932 100644
--- a/packages/overlayscrollbars/test/jest-jsdom/overlayscrollbars.test.ts
+++ b/packages/overlayscrollbars/test/jest-jsdom/overlayscrollbars.test.ts
@@ -349,6 +349,7 @@ describe('overlayscrollbars', () => {
       const onUpdated = jest.fn();
       const onUpdated2 = jest.fn();
       const onDestroyed = jest.fn();
+      const onScroll = jest.fn();
 
       expect(onInitialized).not.toHaveBeenCalled();
       const osInstance = OverlayScrollbars(
@@ -358,6 +359,7 @@ describe('overlayscrollbars', () => {
           initialized: onInitialized,
           updated: [onUpdated, onUpdated, onUpdated2],
           destroyed: onDestroyed,
+          scroll: onScroll,
         }
       );
 
@@ -367,6 +369,14 @@ describe('overlayscrollbars', () => {
       expect(onUpdated).toHaveBeenCalledTimes(1);
       expect(onUpdated2).toHaveBeenCalledTimes(1);
 
+      expect(onScroll).not.toHaveBeenCalled();
+      osInstance.elements().scrollEventElement.dispatchEvent(new Event('scroll'));
+      expect(onUpdated).toHaveBeenCalledTimes(1);
+
+      osInstance.off('scroll', onScroll);
+      osInstance.elements().scrollEventElement.dispatchEvent(new Event('scroll'));
+      expect(onUpdated).toHaveBeenCalledTimes(1);
+
       osInstance.update(true);
 
       expect(onUpdated).toHaveBeenCalledTimes(2);