init jest

package.json

@@ -3,7 +3,7 @@
     "version": "0.1.0",
     "main": "./src/index.tsx",
     "scripts": {
-        "test": "echo \"Error: no test specified\" && exit 1",
+        "test": "jest",
         "start": "brojs server --port=8099 --with-open-browser",
         "build": "npm run clean && brojs build --dev",
         "build:prod": "npm run clean && brojs build",
@@ -29,6 +29,7 @@
     },
     "devDependencies": {
         "@eslint/js": "^9.14.0",
+        "@types/jest": "^29.5.14",
         "@types/react": "^18.3.12",
         "@types/react-dom": "^18.3.1",
         "@types/webpack-env": "^1.18.5",
@@ -39,6 +40,8 @@
         "eslint-plugin-react": "^7.37.2",
         "eslint-plugin-react-hooks": "^5.0.0",
         "globals": "^15.12.0",
+        "jest": "^29.7.0",
+        "jest-environment-jsdom": "^29.7.0",
         "typescript-eslint": "^8.13.0"
     }
 }