Updates to test to fix error. No 200 status code given and update for repeat user in DB

ProjectSourceCode/test/server.spec.js

@@ -36,7 +36,7 @@ describe('Server!', () => {
     it('positive: /register', done => {
       // Define mock user data
       const userData = {
-        username: 'Vishal',
+        username: 'Test User',
         password: '123456'
       };
       // Make a POST request to /register with mock user data