class ActionDispatch::AssertionResponse

def initialize(code_or_name)

indicating any 200-299 status code).
('404') or a response status range as a Symbol pseudo-code (:success,
Accepts a specific response status code as an Integer (404) or String
def initialize(code_or_name)
  if code_or_name.is_a?(Symbol)
    @name = code_or_name
    @code = code_from_name(code_or_name)
  else
    @name = name_from_code(code_or_name)
    @code = code_or_name
  end
  raise ArgumentError, "Invalid response name: #{name}" if @code.nil?
  raise ArgumentError, "Invalid response code: #{code}" if @name.nil?
end