This app uses MongoDB/mongoose to post, get, put, and delete Cat instances from the database.

startServer : Connects to the MongoDB URI via mongoose and starts the server listening.

stopServer : Disconnects from mongoose and closes the server.

Router.post(/api/cats, json, callback) : Creates a new Cat and posts it to the /api/cats route. Will check to see if the request includes all necessary keys.

• Successful post: 200 status
• No name/color/favoriteFood/age passed: 400 status

Example return of single id (Router.post, Router.put, Router.get when no id passed):

   { _id: '5ae8e7786d6b20f575862544',
     name: 'Bulah',
     color: 'black',
     favoriteFood: 'Tuna',
     age: 5,
     __v: 0 }

Router.get(/api/cats/:id?, callback) : If no id is passed, retrieves all the cats currently in the database. If id is passed, looks for cat at the id specified in the request parameters. Checks that a defined cat has been returned from the request.

• Successful retrieval of all cats: 200 status
• Server error: 500 status
• Successful retrieval of one cat: 200 status
• Cat returned but undefined: 404 status
• No cat found at id: 404 status

Example return from Router.get() when no id is passed:

 [
     { _id: '5ae8e7786d6b20f575862544',
       name: 'Bulah',
       color: 'black',
       favoriteFood: 'Tuna',
       age: 5,
       __v: 0 },
   
     { _id: '5ae8e839cc6c98f5c93e31bd',
       name: 'Margaret',
       color: 'white',
       favoriteFood: 'Chicken',
       age: 6,
       __v: 0 }
 ]

Router.put(/api/cats/:id?, json, callback) : Updates the Cat at the specified id and returns updated cat. Checks that id has been passed in.

• Successful update: 200 status
• No id passed: 400 status
• Invalid id passed: 404 status

Router.delete(/api/cats/:id?, callback) : Looks for a cat at the specified id and deletes it. Will check that id has been passed.

• No id passed: 400 status
• Successful deletion: 204 status
• No cat found at id: 404 status

Requires name (string, unique), color (string), favoriteFood (string), and age (number).

To test, run the following commands in your terminal:

npm run dbon (Turns on MongoDB)
npm run test (Initiates testing)

When finished, run:

npm run dboff (Turns off MongoDB)