TaxCategory: added exempt attributes.

lib/xrechnung/tax_category.rb

@@ -29,6 +29,14 @@ class TaxCategory
     #   @return [String]
     member :tax_scheme_id, type: String, default: "VAT"
 
+    # @!attribute tax_exemption_reason_code
+    #   @return [String]
+    member :tax_exemption_reason_code, type: String
+
+    # @!attribute tax_exemption_reason
+    #   @return [String]
+    member :tax_exemption_reason, type: String
+
     # noinspection RubyResolve
     def to_xml(xml, root_tag_name: :TaxCategory)
       xml.cac root_tag_name do
@@ -37,6 +45,11 @@ def to_xml(xml, root_tag_name: :TaxCategory)
         xml.cac :TaxScheme do
           xml.cbc :ID, tax_scheme_id
         end
+
+        unless tax_exemption_reason_code.nil?
+          xml.cbc :TaxExemptionReasonCode, tax_exemption_reason_code
+          xml.cbc :TaxExemptionReason, tax_exemption_reason
+        end
       end
     end
   end

spec/fixtures/ruby/tax_category.rb

@@ -1,7 +1,14 @@
-def build_tax_category
-  Xrechnung::TaxCategory.new(
+def build_tax_category(exempt: false)
+  category = Xrechnung::TaxCategory.new(
     id:            "S",
     percent:       16,
     tax_scheme_id: "VAT",
   )
+
+  return category unless exempt
+
+  category.tax_exemption_reason_code = "VATEX-EU-S"
+  category.tax_exemption_reason      = "Exempt"
+
+  category
 end

spec/fixtures/scraps/tax_category.xml

@@ -4,4 +4,6 @@
   <cac:TaxScheme>
     <cbc:ID>VAT</cbc:ID>
   </cac:TaxScheme>
+  <cbc:TaxExemptionReasonCode>VATEX-EU-S</cbc:TaxExemptionReasonCode>
+  <cbc:TaxExemptionReason>Exempt</cbc:TaxExemptionReason>
 </cac:TaxCategory>

spec/xrechnung/tax_category_spec.rb

@@ -3,6 +3,6 @@
 
 RSpec.describe Xrechnung::TaxCategory do
   it "generates xml" do
-    expect_xml_eq_fixture(build_tax_category, "tax_category")
+    expect_xml_eq_fixture(build_tax_category(exempt: true), "tax_category")
   end
 end