Add unit tests and fix map load

package.json

@@ -3,8 +3,9 @@
   "version": "0.0.0",
   "private": true,
   "scripts": {
-    "dev": "vite",
     "build": "vite build",
+    "test:unit": "vue-cli-service test:unit",
+    "dev": "vite",
     "preview": "vite preview"
   },
   "dependencies": {
@@ -26,6 +27,9 @@
   },
   "devDependencies": {
     "@vitejs/plugin-vue": "^4.0.0",
+    "@vue/cli-plugin-unit-mocha": "~5.0.0",
+    "@vue/test-utils": "^2.0.0-0",
+    "chai": "^4.2.0",
     "vite": "^4.0.0"
   }
 }