Test that changes to item totals are respected

Co-authored-by: Adam Mueller <adam@super.gd>
Co-authored-by: Andrew Stewart <andrew@super.gd>
Co-authored-by: Jared Norman <jared@super.gd>
Co-authored-by: Noah Silvera <noah@super.gd>
Co-authored-by: benjamin wil <benjamin@super.gd>
Co-Authored-By: Sofia Besenski <sofia@super.gd>
Co-Authored-By: Chris Todorov <chris@super.gd>

Author: 8 people

core/spec/models/spree/order_updater_spec.rb

@@ -29,6 +29,15 @@ module Spree
         }.to change { order.item_total }.to 20
       end
 
+      it "respects changes to item totals" do
+        updater.recalculate
+        order.line_items.first.update(quantity: 2)
+
+        expect {
+          updater.recalculate
+        }.to change { order.item_total }.by 10
+      end
+
       it "update shipment total" do
         create(:shipment, order:, cost: 10)
         expect {