如何测试要求用户登录的操作？

session

def setup
  # log the user in, this will happen before every test
end

# integration test
test \"I should see my posts\" do
  #setup should have happened before this, and I should be logged in
  get posts_path
  assert ...
end

test \"should login\" do
  dave = users(:one)
  post :create, :name => dave.name, :password => \'secret\'
  assert_redirected_to admin_url
  assert_equal dave.id, session[:user_id]
end