Testing

package.json

@@ -7,7 +7,10 @@
     "build": "wrangler deploy --dry-run --outdir=dist",
     "format": "prettier --write '**/*.{js,ts,css,json,md}'",
     "dev": "wrangler dev",
-    "deploy": "wrangler deploy --env production"
+    "deploy": "wrangler deploy --env production",
+    "test": "vitest run",
+    "test:watch": "vitest",
+    "test:coverage": "vitest run --coverage"
   },
   "author": "",
   "license": "MIT",
@@ -15,8 +18,12 @@
     "@cloudflare/workers-types": "^4.20250224.0",
     "@types/mailparser": "^3.4.5",
     "@types/rss": "^0.0.32",
+    "@vitest/coverage-v8": "^1.3.1",
+    "happy-dom": "^13.3.8",
+    "msw": "^2.2.1",
     "prettier": "^3.5.2",
     "typescript": "^5.7.3",
+    "vitest": "^1.3.1",
     "wrangler": "^3.111.0"
   },
   "dependencies": {