Add some tests

package.json

@@ -6,7 +6,8 @@
   "scripts": {
     "dev": "vite --host --debug",
     "build": "vue-tsc && vite build",
-    "preview": "vite preview"
+    "preview": "vite preview",
+    "test": "vitest"
   },
   "dependencies": {
     "@heroicons/vue": "^2.0.18",
@@ -30,6 +31,7 @@
     "typescript": "^5.0.2",
     "vite": "^5.2.11",
     "vite-plugin-runtime-env": "^0.1.1",
+    "vitest": "^1.6.0",
     "vue-tsc": "^2.0.18"
   }
 }