update test with assert and moved it into test folder to work with Mocha

test/test.js

@@ -0,0 +1,16 @@
+const assert = require('assert')
+const dessertGenerator = require('../index')
+
+describe('dessertGenerator', function() {
+  describe('generateDessert', function() {
+    it('should return a dessert which is a string', function() {
+      assert.strictEqual(typeof dessertGenerator.generateDessert(), 'string')
+    })
+  })
+
+  describe('generateYummyDessert', function() {
+    it('should return a dessert and adjective which are both string', function() {
+      assert.strictEqual(typeof dessertGenerator.generateDessert(), 'string')
+    })
+  })
+})