user_spec.rb

module JqueryRspecHelpers
  def stub_http(action, url, result)
    expect(HTTP).to receive(action).with(url).and_yield(result)
  end
end

describe User do
  describe ".current" do
    it "should make an http request for user details" do
      stub_http(:get, '/current_user', { "name" => "Fred", "admin" => true })
      current = User.current
      expect(current.name).to eq("Fred")
    end
  end
end