Update OrderTaxAdjustmentsFetcher

app/services/order_tax_adjustments_fetcher.rb

@@ -22,7 +22,7 @@ class OrderTaxAdjustmentsFetcher
   def all
     Spree::Adjustment
       .with_tax
-      .where(order_adjustments.or(line_item_adjustments))
+      .where(order_adjustments.or(line_item_adjustments).or(shipment_adjustments))
       .order('created_at ASC')
   end
 
@@ -36,6 +36,11 @@ class OrderTaxAdjustmentsFetcher
       .and(table[:adjustable_type].eq('Spree::LineItem'))
   end
 
+  def shipment_adjustments
+    table[:order_id].eq(order.id)
+      .and(table[:adjustable_type].eq('Spree::Shipment'))
+  end
+
   def table
     @table ||= Spree::Adjustment.arel_table
   end

spec/services/order_tax_adjustments_fetcher_spec.rb

@@ -86,7 +86,7 @@ describe OrderTaxAdjustmentsFetcher do
 
     subject { OrderTaxAdjustmentsFetcher.new(order).totals }
 
-    it "returns a hash with all 3 taxes" do
+    it "returns a hash with all 4 taxes" do
       expect(subject.size).to eq(4)
     end