added tests and tried bonus

index.js

@@ -0,0 +1,7 @@
+'use strict';
+
+const greet = require('./lib/greet.js');
+
+greet.sayHi();
+greet.sayBye();
+greet.randomGreeting();

lib/greet.js

@@ -0,0 +1,17 @@
+'use strict';
+
+
+module.exports = exports = {};
+
+exports.sayHi = function greet(name) {
+  if(arguments.length === 0) throw new Error('name not provided');
+  return `hello ${name}!`;
+};
+
+exports.sayBye = function () {
+  console.log('adios');
+
+exports.randomGreeting = function(){
+  let someName = process.argv[2];
+}
+};

test/greet-test.js

@@ -0,0 +1,24 @@
+'use strict';
+
+const greet = require ('../lib/greet.js');
+const assert = require ('assert');
+
+describe('Greeting Module',function() {
+  describe('#sayHi', function (){
+    it('should return hello cayla!', function(){
+      var result = greet.sayHi('cayla');
+      assert.ok(result === 'hello cayla!', 'not equal to hello cayla');
+    });
+    it('should throw a missing name name error', function(){
+      assert.throws(function(){
+        greet.sayHi();
+      },'error not thrown');
+    });
+  });
+  describe('#sayBye', function(){
+    it('should return see ya later!!', function(){
+      var adios = 'see ya later!!';
+      assert.ok(adios === 'see ya later!!', 'not equal to see ya later!!');
+    });
+  });
+});