test/postman#7 Seats Endpoints

Make Test to all the endpoints to see if the responses are correct and it function correctly.

• GET: 'seats/', 'seats/:id'
• POST: 'seats/'
• PUT: 'seats/:id'
• PATCH: 'seats/:id'
• DELETE: 'seats/:id'

Later of this save all the tests and add it to the repo those files.