module ActionDispatch::Assertions::ResponseAssertions

def assert_redirected_to(options = {}, message=nil)


assert_redirected_to @customer
# assert that the redirection was to the url for @customer

assert_redirected_to login_url
# assert that the redirection was to the named route login_url

assert_redirected_to :controller => "weblog", :action => "index"
# assert that the redirection was to the "index" action on the WeblogController

==== Examples

match the redirection of redirect_to(:controller => "weblog", :action => "show") and so on.
This match can be partial, such that assert_redirected_to(:controller => "weblog") will also
Assert that the redirection options passed in match those of the redirect called in the latest action. 
def assert_redirected_to(options = {}, message=nil)
  assert_response(:redirect, message)
  return true if options == @response.location
  redirect_is       = normalize_argument_to_redirection(@response.location)
  redirect_expected = normalize_argument_to_redirection(options)
  if redirect_is != redirect_expected
    flunk "Expected response to be a redirect to <#{redirect_expected}> but was a redirect to <#{redirect_is}>"
  end
end

def assert_response(type, message = nil)


assert_response 401
# assert that the response code was status code 401 (unauthorized)

assert_response :redirect
# assert that the response was a redirection

==== Examples

See Rack::Utils::SYMBOL_TO_STATUS_CODE for a full list.
or its symbolic equivalent assert_response(:not_implemented).
You can also pass an explicit status number like assert_response(501)

* :error - Status code was in the 500-599 range
* :missing - Status code was 404
* :redirect - Status code was in the 300-399 range
* :success - Status code was 200

Asserts that the response is one of the following types: 
def assert_response(type, message = nil)
  validate_request!
  if type.in?([:success, :missing, :redirect, :error]) && @response.send("#{type}?")
    assert_block("") { true } # to count the assertion
  elsif type.is_a?(Fixnum) && @response.response_code == type
    assert_block("") { true } # to count the assertion
  elsif type.is_a?(Symbol) && @response.response_code == Rack::Utils::SYMBOL_TO_STATUS_CODE[type]
    assert_block("") { true } # to count the assertion
  else
    flunk(build_message(message, "Expected response to be a <?>, but was <?>", type, @response.response_code))
  end
end

def normalize_argument_to_redirection(fragment) 

def normalize_argument_to_redirection(fragment)
  case fragment
  when %r{^\w[A-Za-z\d+.-]*:.*}
    fragment
  when String
    @request.protocol + @request.host_with_port + fragment
  when :back
    raise RedirectBackError unless refer = @request.headers["Referer"]
    refer
  else
    @controller.url_for(fragment)
  end.gsub(/[\0\r\n]/, '')
end

def parameterize(value)

Proxy to to_param if the object will respond to it. 
def parameterize(value)
  value.respond_to?(:to_param) ? value.to_param : value
end

def validate_request! 

def validate_request!
  unless @request.is_a?(ActionDispatch::Request)
    raise ArgumentError, "@request must be an ActionDispatch::Request"
  end
end