least_coupling.rb

require 'rails_helper'

RSpec.describe StartersController do
  describe "#index" do
    fake(:starter_pet_finder, :all => [])
    before do
      stub(Tressonia::Pets::StarterPetFinder).new { starter_pet_finder }
      get :index
    end
    it "finds the pets" do
      expect(starter_pet_finder).to have_received.all
      expect(assigns(:pets)).to eq starter_pet_finder.all
    end
  end
end