https://github.com/WWBN/AVideo/issues/8137

node_modules/flickity/test/unit/destroy.js

@@ -0,0 +1,23 @@
+QUnit.test( 'destroy', function( assert ) {
+
+  let elem = document.querySelector('#destroy');
+  let flkty = new Flickity( elem );
+
+  let done = assert.async();
+  // do it async
+  setTimeout( function() {
+    flkty.destroy();
+    assert.strictEqual( elem.flickityGUID, undefined, 'flickityGUID removed' );
+    assert.ok( !flkty.isActive, 'not active' );
+    assert.ok( !Flickity.data( elem ), '.data() returns falsey' );
+    assert.ok( elem.children[0], '.cell', 'cell is back as first child' );
+    assert.ok( !elem.matches('.flickity-enabled'), 'flickity-enabled class removed' );
+    assert.ok( !elem.querySelector('.flickity-prev-next-button'), 'no buttons' );
+    assert.ok( !elem.querySelector('.flickity-page-dots'), 'no page dots' );
+    assert.ok( !elem.style.height, 'no height set' );
+    assert.ok( !elem.children[0].style.left, 'first cell has no left position' );
+
+    done();
+  }, 20 );
+
+} );