update to v2.2.1

fix type issues with root object wrapping node or querySelector
fix incorrect import in demo
fix unused options in vite.config.js
add (some) tests - more to come!

package.json

@@ -1,6 +1,6 @@
 {
   "name": "fluent-dom-esm",
-  "version": "2.2.0",
+  "version": "2.2.1",
   "description": "",
   "license": "WTFPL",
   "exports": {
@@ -21,13 +21,16 @@
     "preview": "vite preview",
     "prepublishOnly": "yarn build",
     "postpublish": "git push && git push --tags",
-    "test": "echo 'No tests yet!'"
+    "test": "vitest"
   },
   "devDependencies": {
+    "@testing-library/jest-dom": "^6.8.0",
+    "happy-dom": "^18.0.1",
     "prettier": "^3.6.2",
     "typescript": "^5.9.2",
     "unplugin-dts": "1.0.0-beta.6",
-    "vite": "^7.1.5"
+    "vite": "^7.1.5",
+    "vitest": "^3.2.4"
   },
   "packageManager": "yarn@4.9.4"
 }