11768: add roundoff

- Fix lint issues

app/models/spree/order.rb

@@ -626,7 +626,8 @@ module Spree
 
     # @return [BigDecimal] The rate of the voucher if applied to the order
     def applied_voucher_rate
-      # As an order can have only one voucher, hence using +take+ because each voucher adjustment will have the same voucher
+      # As an order can have only one voucher,
+      # hence using +take+ as each voucher adjustment will have the same voucher
       return BigDecimal(0) unless (voucher_adjustment = voucher_adjustments.take)
 
       voucher = voucher_adjustment.originator

lib/reporting/reports/enterprise_fee_summary/enterprise_fees_with_tax_report_by_order.rb

@@ -308,7 +308,8 @@ module Reporting
 
         def apply_voucher_on_amount(order, amount)
           rate = order.applied_voucher_rate
-          amount + (amount*rate)
+          result = amount + (amount * rate)
+          BigDecimal(result.to_s).round(2, BigDecimal::ROUND_HALF_UP)
         end
       end
     end

spec/models/spree/order_spec.rb

@@ -1578,7 +1578,9 @@ describe Spree::Order do
       end
 
       context "when order has voucher_percentage_rate adjustment" do
-        let(:voucher) { create(:voucher_percentage_rate, enterprise: order.distributor, amount: 10) }
+        let(:voucher) do
+          create(:voucher_percentage_rate, enterprise: order.distributor, amount: 10)
+        end
 
         it 'returns the BigDecimal 0 value' do
           actual = order.applied_voucher_rate