Feat: make validation optional to allow other VAT calculations

lib/secretariat/invoice.rb

@@ -104,12 +104,12 @@ def namespaces(version: 1)
       )
     end
 
-    def to_xml(version: 1)
+    def to_xml(version: 1, validate: true)
       if version < 1 || version > 2
         raise 'Unsupported Document Version'
       end
 
-      unless valid?
+      if validate && !valid?
         raise ValidationError.new("Invoice is invalid", errors)
       end
 
@@ -147,7 +147,7 @@ def to_xml(version: 1)
 
             if version == 2
               line_items.each_with_index do |item, i|
-                item.to_xml(xml, i + 1, version: version) # one indexed
+                item.to_xml(xml, i + 1, version: version, validate: validate) # one indexed
               end
             end
 

lib/secretariat/line_item.rb

@@ -84,8 +84,8 @@ def tax_category_code(version: 2)
       TAX_CATEGORY_CODES[tax_category] || 'S'
     end
 
-    def to_xml(xml, line_item_index, version: 2)
-      if !valid?
+    def to_xml(xml, line_item_index, version: 2, validate: true)
+      if validate && !valid?
         pp errors
         raise ValidationError.new("LineItem #{line_item_index} is invalid", errors)
       end