chore: rubocop

chore: fix api test conventions

chore: rubocop -A spec/

chore: more rubocop -A

fix failing test

rubocop fixes

removes helper methods that are in my opinion dead code

more rubocop fixes

rubocop -a --auto-gen-config

app/helpers/finance/balancing_helper.rb

@@ -2,11 +2,11 @@ module Finance::BalancingHelper
   def balancing_view_partial
     view = params[:view] || 'edit_results'
     case view
-    when 'edit_results' then
+    when 'edit_results'
       'edit_results_by_articles'
-    when 'groups_overview' then
+    when 'groups_overview'
       'shared/articles_by/groups'
-    when 'articles_overview' then
+    when 'articles_overview'
       'shared/articles_by/articles'
     end
   end

app/helpers/finance/invoices_helper.rb

@@ -1,9 +1,9 @@
 module Finance::InvoicesHelper
-  def format_delivery_item delivery
+  def format_delivery_item(delivery)
     format_date(delivery.date)
   end
 
-  def format_order_item order
+  def format_order_item(order)
     "#{format_date(order.ends)} (#{number_to_currency(order.sum)})"
   end
 end