Spec to display a weird behavior in Rack::URLMap

spec_urlmap_with_domain_specific_routes.rb

require 'rack/urlmap'
require 'rack/mock'

describe Rack::URLMap do
  it "dispatches domain-specific routes correctly" do
    map = Rack::URLMap.new("http://foo.org/" => lambda { |env|
                             [200,
                              { "Content-Type" => "text/plain",
                                "X-Position" => "foo.org",
                                "X-Host" => env["HTTP_HOST"] || env["SERVER_NAME"],
                              }, [""]]},
                           "/" => lambda { |env|
                             [200,
                              { "Content-Type" => "text/plain",
                                "X-Position" => "default.org",
                                "X-Host" => env["HTTP_HOST"] || env["SERVER_NAME"],
                              }, [""]]}
                           )

    res = Rack::MockRequest.new(map).get("http://foo.org/")
    res.should.be.ok
    res["X-Position"].should.equal "foo.org"

  end
end