test.rb

class PrepareCalculationForB2BManager
  def prepare(quotation)
    CalculationForB2BManager.new(
      quotation.yearly_premium_value,
      quotation.yearly_offer_number,
      quotation.yearly_premium_url,
      quotation.position_in_leads,
      quotation.token,
      quotation.save_quote_key,
      quotation.competitors
    )
  end
end

CalculationForB2BManager = Struct.new(:calculated_price, 
                                      :yearly_offer_number, 
                                      :yearly_premium_url, 
                                      :position_in_leads, 
                                      :quotation_token, 
                                      :save_quote_key, 
                                      :competitors)

In your code:
unless q.blank?
calc = PrepareCalculationForB2BManager.new.prepare(q)
debug_store.write_req_to_b2b(partner.code, Time.now, calc.inspect)
else
# handle errors
end