diff --git a/index.js b/index.js
new file mode 100644
index 0000000..be7302a
--- /dev/null
+++ b/index.js
@@ -0,0 +1,5 @@
+'use strict';
+
+const greeting = require('./lib/greet.js');
+
+greeting.greet(process.argv[2]);
diff --git a/lib/greet.js b/lib/greet.js
new file mode 100644
index 0000000..82ac030
--- /dev/null
+++ b/lib/greet.js
@@ -0,0 +1,11 @@
+'use strict';
+
+module.exports = exports = {};
+
+exports.greet = function(name) {
+  console.log(`hello ${name}`);
+  if (!arguments.length) throw new Error('name not provided');
+  return `hello ${name}!`;
+};
+
+console.log('hello', process.argv[2]);
diff --git a/test/greet-test.js b/test/greet-test.js
new file mode 100644
index 0000000..47c6e5b
--- /dev/null
+++ b/test/greet-test.js
@@ -0,0 +1,19 @@
+'use strict';
+
+const greeting = require('../lib/greet.js');
+const assert = require('assert');
+
+describe('Greeting Module', function() {
+  describe('#greet', function() {
+    it('should return hello and name if input in command line', function() {
+      var inputName = process.argv[2];
+      let result = greeting.greet(inputName);
+      assert.ok(result === `hello ${inputName}!`, 'but not equal to hello and input name.');
+    });
+    it('should throw an undefined if name argument is not passed in command line', function() {
+      assert.throws(function() {
+        greeting.greet();
+      }, 'error not thrown');
+    });
+  });
+});