add jest and babel for testing

package.json

@@ -7,14 +7,22 @@
     "ts-node": "^10.9.1"
   },
   "devDependencies": {
+    "@babel/core": "^7.21.0",
+    "@babel/preset-env": "^7.20.2",
+    "@jest/globals": "^29.4.3",
     "@types/express": "^4.17.17",
     "@types/pg": "^8.6.6",
     "@typescript-eslint/eslint-plugin": "^5.54.0",
+    "babel-jest": "^29.4.3",
     "eslint": "^8.35.0",
     "eslint-config-standard-with-typescript": "^34.0.0",
     "eslint-plugin-import": "^2.27.5",
     "eslint-plugin-n": "^15.6.1",
     "eslint-plugin-promise": "^6.1.1",
+    "jest": "^29.4.3",
     "typescript": "^4.9.5"
+  },
+  "scripts": {
+    "test": "jest"
   }
 }