RSpec routing trouble

gistfile1.rb

# Using Rails 2.2.2 and RSpec + RSpec-Rails 1.1.11,
#
# The specs below all pass when I run:
# $ ./script/spec spec/controllers/admin/status_controller_spec.rb
#
# But when I run:
# $ rake spec
# all three fail with:
#
# 1)
# ActionController::RoutingError in 'Admin::StatusController routing should route /admin/status to the index action'
# No route matches "/admin/status" with {:method=>:get}
# ./spec/controllers/admin/status_controller_spec.rb:18:
#
# 2)
# ActionController::RoutingError in 'Admin::StatusController should render the text OK'
# No route matches {:controller=>"admin/status", :action=>"index"}
# ./spec/controllers/admin/status_controller_spec.rb:11:
#
# 3)
# ActionController::RoutingError in 'Admin::StatusController should return a 200 response code'
# No route matches {:controller=>"admin/status", :action=>"index"}
# ./spec/controllers/admin/status_controller_spec.rb:6:
#
# Removing the namespace did not change anything

# config/routes.rb
ActionController::Routing::Routes.draw do |map|
  map.namespace :admin do |admin_map|
    admin_map.status 'status', :controller => 'status'
  end
end

# app/controllers/admin/status_controller.rb
module Admin
  class StatusController < ApplicationController
    def index
      render :text => 'OK'
    end
  end
end

# spec/controllers/admin/status_controller_spec.rb
require File.expand_path(File.dirname(__FILE__) + '/../../spec_helper')

module Admin
  describe StatusController do
    it 'should return a 200 response code' do
      get :index
      response.should be_success
    end

    it 'should render the text OK' do
      get :index
      response.body.should eql('OK')
    end
  end

  describe StatusController, 'routing' do
    it 'should route /admin/status to the index action' do
      params_from(:get, '/admin/status').should eql({:controller => 'admin/status', :action => 'index'})
    end
  end
end