bundle-modularity.js: add file extensions

js/tests/integration/bundle-modularity.js

diff --git a/js/tests/integration/bundle-modularity.js b/js/tests/integration/bundle-modularity.js
index 13498ba..dbfd568 100644
--- a/js/tests/integration/bundle-modularity.js
+++ b/js/tests/integration/bundle-modularity.js
@@ -1,9 +1,9 @@
-/* eslint-disable import/extensions, import/no-unassigned-import */
+/* eslint-disable import/no-unassigned-import */
 
-import Tooltip from '../../dist/tooltip'
-import '../../dist/carousel'
+import Tooltip from '../../dist/tooltip.js'
+import '../../dist/carousel.js'
 
 window.addEventListener('load', () => {
-  [...document.querySelectorAll('[data-bs-toggle="tooltip"]')]
+  [].concat(...document.querySelectorAll('[data-bs-toggle="tooltip"]'))
     .map(tooltipNode => new Tooltip(tooltipNode))
 })