Added basic tests for testing a real websocket

app/package.json

@@ -25,6 +25,7 @@
         "@sveltejs/vite-plugin-svelte": "^6.2.1",
         "@types/eslint": "^9.6.1",
         "@types/three": "^0.180.0",
+        "@types/ws": "^8.18.1",
         "@typescript-eslint/eslint-plugin": "^8.46.0",
         "@typescript-eslint/parser": "^8.46.0",
         "autoprefixer": "^10.4.21",
@@ -44,7 +45,8 @@
         "typescript-eslint": "^8.51.0",
         "unplugin-icons": "^22.4.2",
         "vite": "^7.1.9",
-        "vitest": "^3.2.4"
+        "vitest": "^3.2.4",
+        "ws": "^8.18.3"
     },
     "type": "module",
     "dependencies": {