class ActionDispatch::TestRequest

def self.create(env = {})

Create a new test request with default +env+ values. 
def self.create(env = {})
  env = Rails.application.env_config.merge(env) if defined?(Rails.application) && Rails.application
  env["rack.request.cookie_hash"] ||= {}.with_indifferent_access
  new(default_env.merge(env))
end