Handle edge case and add tests for functions

client/package.json

@@ -18,7 +18,9 @@
     "dev": "vite",
     "build": "tsc -b && vite build",
     "lint": "eslint .",
-    "preview": "vite preview"
+    "preview": "vite preview",
+    "test": "jest --config jest.config.cjs",
+    "test:watch": "jest --config jest.config.cjs --watch"
   },
   "dependencies": {
     "@modelcontextprotocol/sdk": "^1.4.1",
@@ -45,6 +47,7 @@
   },
   "devDependencies": {
     "@eslint/js": "^9.11.1",
+    "@types/jest": "^29.5.14",
     "@types/node": "^22.7.5",
     "@types/react": "^18.3.10",
     "@types/react-dom": "^18.3.0",
@@ -55,8 +58,11 @@
     "eslint-plugin-react-hooks": "^5.1.0-rc.0",
     "eslint-plugin-react-refresh": "^0.4.12",
     "globals": "^15.9.0",
+    "jest": "^29.7.0",
+    "jest-environment-jsdom": "^29.7.0",
     "postcss": "^8.4.47",
     "tailwindcss": "^3.4.13",
+    "ts-jest": "^29.2.6",
     "typescript": "^5.5.3",
     "typescript-eslint": "^8.7.0",
     "vite": "^5.4.8"