Added test: dogs#index responds with success
Made it green: dogs#index responds with success
Failing test: fetch all dogs
Green test: fetch all dogs
Refactor: no need to create dogs on every test
Failing test: Api::V1::DogsController#index responds with success
Green: Api::V1::DogsController#index responds with success
Red: respond with the list of dogs in json format
Green: respond with the list of dogs in json format
Refactor: create dogs in test only when needed