Showing the current Rails 3.1 bug where generating a new session Set-Cookie header crashes Rack if :domain => :all

rails_session_bug_spec.rb

require 'spec_helper'

class AbstractStoreSubclass < ActionDispatch::Session::AbstractStore
  def get_session(env, sid)
    [sid || generate_sid, nil]
  end

  def set_session(env, sid, data, options)
  end

  def destroy_session(env, sid, options)
  end
end

describe AbstractStoreSubclass do
  let(:response)  { [200, {}, ""] }
  let(:app)       { stub(:app, :call => response) }
  let(:host)      { "site.com" }
  let(:env) do
    {
      "HTTP_HOST"   => host
    }
  end
  let(:options) do
    {
      :ttl       => 12.hours,
      :domain    => "site.com",
      :key       => "SID"
    }
  end
  let(:store)   { AbstractStoreSubclass.new(app, options) }
  let(:session) { env["rack.session"] }

  describe "writing" do
    context "without a session id" do
      before(:each) do
        app.stub(:call) { session[:a] = "b"; response }
      end

      it "generates a new session id" do
        store.call(env)
        env["rack.session.options"][:id].should_not be_nil
      end

      describe "using an :all domain" do
        before(:each) do
          options[:domain] = :all
        end

        it "does not crash Rack" do
          store.call(env)
        end
      end
    end
  end
end