Update OrderAdjustmentsFetcher

app/services/order_tax_adjustments_fetcher.rb

@@ -21,7 +21,6 @@ class OrderTaxAdjustmentsFetcher
 
   def all
     Spree::Adjustment
-      .with_tax
       .where(order_adjustments.or(line_item_adjustments).or(shipment_adjustments))
       .order('created_at ASC')
   end
@@ -50,11 +49,27 @@ class OrderTaxAdjustmentsFetcher
 
     Hash[tax_rates.collect do |tax_rate|
       tax_amount = if tax_rates.one?
-                     adjustment.included_tax
+                     adjustment_tax_amount(adjustment)
                    else
                      tax_rate.compute_tax(adjustment.amount)
                    end
       [tax_rate, tax_amount]
     end]
   end
+
+  def adjustment_tax_amount(adjustment)
+    if no_tax_adjustments?(adjustment)
+      adjustment.included_tax
+    else
+      adjustment.amount
+    end
+  end
+
+  def no_tax_adjustments?(adjustment)
+    # Enterprise Fees, Admin Adjustments, and Shipping Fees currently do not have tax adjustments.
+    # The tax amount is stored in the included_tax attribute.
+    adjustment.originator_type == "EnterpriseFee" ||
+      adjustment.originator_type == "Spree::ShippingMethod" ||
+      (adjustment.source_type.nil? && adjustment.originator_type.nil?)
+  end
 end

spec/services/order_tax_adjustments_fetcher_spec.rb

@@ -44,8 +44,9 @@ describe OrderTaxAdjustmentsFetcher do
                               tax_category: tax_category20,
                               calculator: Calculator::FlatRate.new(preferred_amount: 48.0))
     end
-    let(:additional_adjustment) do
-      create(:adjustment, amount: 50.0, included_tax: tax_rate25.compute_tax(50.0))
+    let(:admin_adjustment) do
+      create(:adjustment, order: order, amount: 50.0, included_tax: tax_rate25.compute_tax(50.0),
+                          source: nil, label: "Admin Adjustment")
     end
 
     let(:order_cycle) do
@@ -62,8 +63,7 @@ describe OrderTaxAdjustmentsFetcher do
         line_items: [line_item1, line_item2],
         bill_address: create(:address),
         order_cycle: order_cycle,
-        distributor: coordinator,
-        adjustments: [additional_adjustment]
+        distributor: coordinator
       )
     end
 
@@ -80,6 +80,8 @@ describe OrderTaxAdjustmentsFetcher do
     end
 
     before do
+      order.reload
+      order.adjustments << admin_adjustment
       order.create_tax_charge!
       order.recreate_all_fees!
     end
@@ -102,7 +104,7 @@ describe OrderTaxAdjustmentsFetcher do
       expect(subject[tax_rate20]).to eq(8.0)
     end
 
-    it "contains tax on order adjustment" do
+    it "contains tax on admin adjustment" do
       expect(subject[tax_rate25]).to eq(10.0)
     end
   end