add buyer#id (BT-46)

Author: ronald

lib/secretariat/trade_party.rb

@@ -18,10 +18,14 @@ module Secretariat
   using ObjectExtensions
 
   TradeParty = Struct.new('TradeParty',
+    :id,
     :name, :street1, :street2, :city, :postal_code, :country_id, :vat_id, :global_id, :global_id_scheme_id, :tax_id,
     keyword_init: true,
   ) do
     def to_xml(xml, exclude_tax: false, version: 2)
+      if id
+        xml['ram'].ID id # BT-46
+      end
       if global_id.present? && global_id_scheme_id.present?
         xml['ram'].GlobalID(schemeID: global_id_scheme_id) do
           xml.text(global_id)

test/invoice_test.rb

@@ -15,6 +15,7 @@ def make_eu_invoice(tax_category: :REVERSECHARGE)
         vat_id: 'DE304755032'
       )
       buyer = TradeParty.new(
+        id: 'Kunde 4711',
         name: 'Depfu inc',
         street1: 'Quickbornstr. 46',
         city: 'Hamburg',
@@ -367,6 +368,7 @@ def test_simple_eu_invoice_v2
       assert_match(/<ram:CategoryCode>AE<\/ram:CategoryCode>/, xml)
       assert_match(/<ram:ExemptionReason>Reverse Charge<\/ram:ExemptionReason>/, xml)
       assert_match(/<ram:RateApplicablePercent>/, xml)
+      assert_match(%r{<ram:BuyerTradeParty>\s*<ram:ID>Kunde 4711</ram:ID>}, xml)
 
       v = Validator.new(xml, version: 2)
       errors = v.validate_against_schema