diff --git a/index.js b/index.js
new file mode 100644
index 0000000..d240bbb
--- /dev/null
+++ b/index.js
@@ -0,0 +1,3 @@
+const { greet } = require("./src/greet");
+const name = process.argv[2] || "world";
+console.log(greet(name));
diff --git a/package.json b/package.json
index 1f651c2..93c8ab6 100644
--- a/package.json
+++ b/package.json
@@ -4,7 +4,7 @@
   "description": "",
   "main": "index.js",
   "scripts": {
-    "test": "echo \"Error: no test specified\" && exit 1",
+    "test": "node --test",
     "flo": "flo"
   },
   "keywords": [],
diff --git a/src/greet.js b/src/greet.js
new file mode 100644
index 0000000..868b6a1
--- /dev/null
+++ b/src/greet.js
@@ -0,0 +1,4 @@
+function greet(name) {
+  return `Hello, ${name}!`;
+}
+module.exports = { greet };
diff --git a/tests/greet.test.js b/tests/greet.test.js
new file mode 100644
index 0000000..75331db
--- /dev/null
+++ b/tests/greet.test.js
@@ -0,0 +1,13 @@
+const { describe, it } = require('node:test');
+const assert = require('node:assert');
+const { greet } = require('../src/greet');
+
+describe('greet', () => {
+  it('greets by name', () => {
+    assert.strictEqual(greet('Alice'), 'Hello, Alice!');
+  });
+
+  it('handles empty string', () => {
+    assert.strictEqual(greet(''), 'Hello, !');
+  });
+});