gistfile1.rb

require 'test/shoulda_macros/braintree_macros'

class AnalyticsBuilder
  include FactoryGirl::Syntax::Methods
  include BraintreeMacros::Shoulda::Helpers
  include WebMock::API

  def initialize(campaign, &block)
    @campaign = campaign
    stub_braintree_customer_sale_success_with_transaction_ids('123456')
    instance_exec &block
  end

  def customer(*args, &block)
    options = args.extract_options!
    name = args.first || Faker::Name.first_name

    user = create :user, { :first_name => name }.merge(options)
    create :credit_card, :user => user
    OrderAndClaimBuilder.new(@campaign, user, &block)
  end

  def order(options)
    OrderAndClaimBuilder.new(@campaign, options[:user]).order(options[:spend])
  end

  class OrderAndClaimBuilder
    include FactoryGirl::Syntax::Methods

    def initialize(campaign, user, &block)
      @campaign = campaign
      @merchant = campaign.merchants.first
      @user = user
      instance_exec &block if block_given?
    end

    def claim
      create :claim, :user => @user, :campaign => @campaign
    end

    def order(spend)
      create(:order, :user => @user, :merchant => @merchant, :spend => spend).tap &:complete
    end
  end
end

Spec::Runner.configure do |config|
  config.after do
    WebMock.reset!
  end
end

gistfile2.rb

    AnalyticsBuilder.new(campaign) do
      customer do
        claim
        order 15.to_money
      end

      customer do
        claim
        order 25.to_money
      end
    end