gistfile1.rb

before(:each) do
  user = Factory.create(:user, :email => "younotcookin@snakebarf.com")
  login_as(user)
   
  @redis = mock("Redis", :null_object => true)
  Redis.stub!(:new).and_return(@redis)
end
  
it "should add the params to a list for the current user" do
  @redis.should_receive(:new)
  get :index, :params => {}
end

==== controller ===

after_filter :log_params

def log_params
  r = Redis.new
end