diff --git a/__tests__/utils.test.ts b/__tests__/utils.test.ts
new file mode 100644
index 0000000..9c2c072
--- /dev/null
+++ b/__tests__/utils.test.ts
@@ -0,0 +1,52 @@
+import { test, describe } from 'node:test';
+import assert from 'node:assert/strict';
+import { cn } from '../lib/utils';
+
+describe('cn utility function', () => {
+  test('combines basic classes correctly', () => {
+    assert.equal(cn('a', 'b', 'c'), 'a b c');
+  });
+
+  test('handles conditional classes', () => {
+    const condition = true;
+    const falseCondition = false;
+    assert.equal(cn('a', condition && 'b', falseCondition && 'c'), 'a b');
+  });
+
+  test('handles array inputs', () => {
+    assert.equal(cn(['a', 'b'], ['c', 'd']), 'a b c d');
+  });
+
+  test('handles object inputs', () => {
+    assert.equal(cn({ a: true, b: false, c: true }), 'a c');
+  });
+
+  test('handles mixed inputs (string, array, object)', () => {
+    assert.equal(
+      cn('a', ['b', 'c'], { d: true, e: false }, 'f'),
+      'a b c d f'
+    );
+  });
+
+  test('merges tailwind classes correctly (twMerge)', () => {
+    // p-4 and p-8 are conflicting padding classes, twMerge should keep the last one
+    assert.equal(cn('p-4', 'p-8'), 'p-8');
+
+    // text-red-500 and text-blue-500 are conflicting text color classes
+    assert.equal(cn('text-red-500', 'text-blue-500'), 'text-blue-500');
+
+    // bg-red-500 and hover:bg-blue-500 do not conflict directly but are related
+    assert.equal(
+      cn('bg-red-500 hover:bg-blue-500', 'bg-blue-500'),
+      'hover:bg-blue-500 bg-blue-500'
+    );
+  });
+
+  test('handles falsy values', () => {
+    assert.equal(cn('a', null, undefined, false, 0, '', 'b'), 'a b');
+  });
+
+  test('handles empty input', () => {
+    assert.equal(cn(), '');
+  });
+});
diff --git a/package-lock.json b/package-lock.json
index 433dffd..81602c7 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -76,6 +76,7 @@
         "serwist": "^9.5.7",
         "shadcn": "^3.8.4",
         "tailwindcss": "^4",
+        "tsx": "^4.21.0",
         "tw-animate-css": "^1.4.0",
         "typescript": "5.7.3"
       }
@@ -10012,6 +10013,21 @@
         "node": ">=14.14"
       }
     },
+    "node_modules/fsevents": {
+      "version": "2.3.3",
+      "resolved": "https://registry.npmjs.org/fsevents/-/fsevents-2.3.3.tgz",
+      "integrity": "sha512-5xoDfX+fL7faATnagmWPpbFtwh/R77WmMMqqHGS65C3vvB0YHrgF+B1YmZ3441tMj5n63k0212XNoJwzlhffQw==",
+      "dev": true,
+      "hasInstallScript": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "darwin"
+      ],
+      "engines": {
+        "node": "^8.16.0 || ^10.6.0 || >=11.0.0"
+      }
+    },
     "node_modules/function-bind": {
       "version": "1.1.2",
       "resolved": "https://registry.npmjs.org/function-bind/-/function-bind-1.1.2.tgz",
@@ -15988,6 +16004,26 @@
       "integrity": "sha512-oJFu94HQb+KVduSUQL7wnpmqnfmLsOA/nAh6b6EH0wCEoK0/mPeXU6c3wKDV83MkOuHPRHtSXKKU99IBazS/2w==",
       "license": "0BSD"
     },
+    "node_modules/tsx": {
+      "version": "4.21.0",
+      "resolved": "https://registry.npmjs.org/tsx/-/tsx-4.21.0.tgz",
+      "integrity": "sha512-5C1sg4USs1lfG0GFb2RLXsdpXqBSEhAaA/0kPL01wxzpMqLILNxIxIOKiILz+cdg/pLnOUxFYOR5yhHU666wbw==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "esbuild": "~0.27.0",
+        "get-tsconfig": "^4.7.5"
+      },
+      "bin": {
+        "tsx": "dist/cli.mjs"
+      },
+      "engines": {
+        "node": ">=18.0.0"
+      },
+      "optionalDependencies": {
+        "fsevents": "~2.3.3"
+      }
+    },
     "node_modules/tunnel-rat": {
       "version": "0.1.2",
       "resolved": "https://registry.npmjs.org/tunnel-rat/-/tunnel-rat-0.1.2.tgz",
diff --git a/package.json b/package.json
index 2ae4b5a..53930a4 100644
--- a/package.json
+++ b/package.json
@@ -6,7 +6,8 @@
     "dev": "next dev",
     "build": "next build",
     "start": "next start",
-    "lint": "eslint"
+    "lint": "eslint",
+    "test": "tsx --test __tests__/**/*.test.ts"
   },
   "dependencies": {
     "@ai-sdk/google": "^3.0.53",
@@ -77,6 +78,7 @@
     "serwist": "^9.5.7",
     "shadcn": "^3.8.4",
     "tailwindcss": "^4",
+    "tsx": "^4.21.0",
     "tw-animate-css": "^1.4.0",
     "typescript": "5.7.3"
   }
diff --git a/tsconfig.json b/tsconfig.json
index f17f736..91136a0 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -19,6 +19,7 @@
     "isolatedModules": true,
     "jsx": "react-jsx",
     "incremental": true,
+    "allowImportingTsExtensions": true,
     "plugins": [
       {
         "name": "next"