diff --git a/index.js b/index.js
new file mode 100644
index 0000000..36c7210
--- /dev/null
+++ b/index.js
@@ -0,0 +1,5 @@
+'use strict';
+
+const greet = require('./lib/greet.js')
+
+greet.sayHi();
diff --git a/lib/greet.js b/lib/greet.js
new file mode 100644
index 0000000..3c927a6
--- /dev/null
+++ b/lib/greet.js
@@ -0,0 +1,8 @@
+'use strict';
+
+module.exports;
+
+exports.sayHi = function(name){
+  if(arguments.length === 0) throw new Error('no name given')
+  return `Hi ${name}.`;
+};
diff --git a/test/greet-test.js b/test/greet-test.js
new file mode 100644
index 0000000..420a9df
--- /dev/null
+++ b/test/greet-test.js
@@ -0,0 +1,13 @@
+'use strics';
+
+const greet = require('../lib/greet.js');
+const assert = require('assert');
+
+describe('Greet Module', function(){
+  describe('#sayHi', function(){
+    it('should return Hi noah.', function(){
+      var result = greet.sayHi('noah');
+      assert.ok(result ==='Hi noah.', 'result is not Hi noah.')
+    })
+  })
+})