use Class.new to avoid override the User class

spec/grape/api_spec.rb

@@ -2417,35 +2417,32 @@ def static
  end
 
  it 'mounts a versioned API with nested resources' do
- class User < Grape::API
- version 'v1'
- resources :users do
- get :hello do
- 'hello users'
- end
+ app = Class.new(Grape::API)
+ app.version 'v1'
+ app.resources :users do
+ get :hello do
+ 'hello users'
  end
  end
- subject.mount User
+ subject.mount app
 
  get '/v1/users/hello'
  expect(last_response.body).to eq('hello users')
  end
 
  it 'mounts a prefixed API with nested resources' do
- class User < Grape::API
- prefix "api"
- resource :users do
- get :hello do
- 'hello users'
- end
+ app = Class.new(Grape::API)
+ app.prefix 'api'
+ app.resources :users do
+ get :hello do
+ 'hello users'
  end
  end
- subject.mount User
+ subject.mount app
 
  get '/api/users/hello'
  expect(last_response.body).to eq('hello users')
  end
-
  end
  end