fix vitest config

Author: ldgit

vitest.config.js

@@ -1,10 +1,12 @@
 import { defineConfig } from 'vite';
 import { svelte } from '@sveltejs/vite-plugin-svelte';
+import { svelteTesting } from '@testing-library/svelte/vite';
 
 export default defineConfig({
   // eslint-disable-next-line no-undef
-  plugins: [svelte({ hot: !process.env.VITEST })],
+  plugins: [svelte({ hot: !process.env.VITEST }), svelteTesting()],
   test: {
+    environment: 'jsdom',
     globals: false,
   },
 });