Setup jest config and added example test.

package.json

@@ -6,7 +6,7 @@
   "scripts": {
     "start": "node dist/index.js",
     "lint": "eslint . --fix",
-    "test": "jest --coverage --verbose"
+    "test": "jest test/ --config jest.config.ts"
   },
   "author": "",
   "license": "GPL-3.0-or-later",
@@ -19,6 +19,7 @@
     "eslint": "^8.50.0",
     "jest": "^29.7.0",
     "ts-jest": "^29.1.1",
+    "ts-node": "^10.9.1",
     "typescript": "^5.2.2"
   },
   "dependencies": {