chore: add jest dependency and related files

jest.config.js

@@ -0,0 +1,5 @@
+/** @type {import('jest').Config} */
+module.exports = {
+	testEnvironment: 'node',
+	transform: { '^.+\\.tsx?$': ['ts-jest', { tsconfig: 'tsconfig.jest.json' }] }
+};

package.json

@@ -10,7 +10,8 @@
   },
   "scripts": {
     "build": "ts-project-builder ./src/**/*.ts --clean",
-    "bumplog": "changelogen --bump"
+    "bumplog": "changelogen --bump",
+    "test": "jest --coverage"
   },
   "dependencies": {
     "@noble/hashes": "^1.4.0",
@@ -25,9 +26,12 @@
   "devDependencies": {
     "@kikiutils/prettierrc": "^1.3.2",
     "@kikiutils/tsconfigs": "^3.0.1",
+    "@types/jest": "^29.5.12",
     "@types/node": "^22.5.0",
     "changelogen": "^0.5.5",
     "hono": "^4.5.8",
+    "jest": "^29.7.0",
+    "ts-jest": "^29.2.5",
     "ts-project-builder": "3.0.1"
   },
   "keywords": [