Self Shunt vs Fake Object in Ruby / RSpec

self_shunt_spec.rb

module Fubarizable
  def fubarize
    "foobar-#{fubarizable}-foobar"
  end
end

class FakeFoobar
  include Fubarizable

  def fubarizable
    "fake"
  end
end

describe "Fubarizable" do
  context "with fake object" do
    it 'is fubarized' do
      expect(FakeFoobar.new.fubarize).to eq 'foobar-fake-foobar'
    end
  end

  context "with self shunt pattern" do
    include Fubarizable

    it 'is fubarized' do
      expect(fubarize).to eq "foobar-self_shunt-foobar"
    end

    def fubarizable
      'self_shunt'
    end
  end
end