Letの効果的な使い方

gistfile1.rb

describe "hoge" do
  bofore do
    get "index" , value
  end
  context "範囲内に収まるパラメータがくる" do
    let (:value) { 123 }
    it { response.should eq true }
  end
  context "範囲内に収まっていないパラメータがくる" do
    let (:value) { 123456 }
    it { response.should eq false }
  end

end