Switching Data Sources: Dual-Class Test

receipt_data_source_transition_spec.rb

require 'rails_helper'

RSpec.describe ReceiptDataSourceTransition do
  describe "get_receipts" do
    before do
      Receipt.delete_all
    end

    it "gets similarly structured responses from both repository and service" do
      #Subjects Under Test
      @repository = Repositories::ReceiptDataSource.new
      @service = Services::ReceiptDataSource.new
      @data_sources = [@repository, @service]

      #Given
      FactoryGirl.create(:receipt, number: 11.40)
      FactoryGirl.create(:receipt, number: 22.50)
      stub_request(:get, "#{ENV['RECEIPT_ENDPOINT']}/receipts.json").
        to_return(body: [
          {"uuid": "324-asd-423-fsd", "relational_id": 1, "number": 11.40},
          {"uuid": "asd-ewr-456-676", "relational_id": 2, "number":  22.50}
        ].to_json)

      #When
      @results = @data_sources.map {|ds| ds.get_receipts }

      #Then
      @results.each do |result|
        expect(result).to respond_to(:each)
        expect(result.length).to eq(2)
        expect(result.first).to respond_to(:number)
      end
    end
    
    ...
    
  end
end