unit tests

package.json

@@ -4,7 +4,7 @@
   "description": "",
   "main": "app.js",
   "scripts": {
-    "test": "echo \"Error: no test specified\" && exit 1"
+    "test": "jest"
   },
   "author": "Sam Hadow",
   "license": "BSD-3-Clause-Attribution",
@@ -16,5 +16,9 @@
     "express-session": "^1.18.1",
     "pg": "^8.13.1",
     "socket.io": "^4.8.1"
+  },
+  "devDependencies": {
+    "@babel/preset-env": "^7.26.8",
+    "jest": "^29.7.0"
   }
 }