Switching Data Sources: Repository Unit Test

receipt_data_source_spec.rb

require 'rails_helper'

RSpec.describe Repositories::ReceiptDataSource do
  describe "get_receipts" do
    before do
      Receipt.delete_all
    end

    it "gets all receipts" do
      @subject_under_test = Repositories::ReceiptDataSource.new

      FactoryGirl.create(:receipt)
      FactoryGirl.create(:receipt)

      #This is an example, but you could do any number and combination of assertions here
      expect(@subject_under_test.get_receipts.length).to eq(2)
      expect(@subject_under_test.get_receipts.first).to be_instance_of(Receipt)
    end
    
    ...
    
  end
end