Threre is no way to test routing with constraints

I have no any idea about how to test these routes:

constraints(:host => /^catalog\./) do
    get 'categories'           => 'categories#index'
    get 'categories/:url_name' => 'categories#show'
end

becauses i don't see the way to change host for this request. It is hardcoded to be 'example.org':

# Return the Rack environment used for a request to +uri+.
def self.env_for(uri="", opts={})
  uri = URI(uri)
  uri.path = "/#{uri.path}" unless uri.path[0] == ?/

  env = DEFAULT_ENV.dup

  env["REQUEST_METHOD"] = opts[:method] ? opts[:method].to_s.upcase : "GET"
  env["SERVER_NAME"] = uri.host || "example.org"

def assert_generates(expected_path, options, defaults={}, extras = {}, message=nil)

    expected_path = "/#{expected_path}" unless expected_path[0] == ?/
    # Load routes.rb if it hasn't been loaded.

"/#{expected_path}... does not allow to pass path like "http://test.host.com/books", That's why URI(uri) cannot parse host

@saks, please don't assign users. Wait until someone comes and assign it properly.

[bulk edit]