rspec letのobject_id

テストコード

require 'rails_helper'

describe 'test' do
  let(:hash){{}}
  describe 'test1' do
    before do
      p hash.object_id
    end
    it 'test' do
      p hash.object_id
      expect(1).to eq 1
    end
  end
  describe 'test2' do
    before do
      p hash.object_id
    end
    it 'test' do
      p hash.object_id
      expect(1).to eq 1
    end
  end
end

結果

各beforeとitは、同じobject_id。
describeごとにobject_idは異なる。

test
  test1
70254598086000
70254598086000
    test
  test2
70254598063460
70254598063460
    test