diff --git a/spec/factories/return_authorization_factory.rb b/spec/factories/return_authorization_factory.rb
new file mode 100644
index 0000000000..ad77351a40
--- /dev/null
+++ b/spec/factories/return_authorization_factory.rb
@@ -0,0 +1,9 @@
+FactoryBot.define do
+  factory :return_authorization, class: Spree::ReturnAuthorization do
+    number '100'
+    amount 100.00
+    association(:order, factory: :shipped_order)
+    reason 'no particular reason'
+    state 'received'
+  end
+end
diff --git a/spec/models/spree/adjustment_spec.rb b/spec/models/spree/adjustment_spec.rb
index 4c1252900b..ef66733ec1 100644
--- a/spec/models/spree/adjustment_spec.rb
+++ b/spec/models/spree/adjustment_spec.rb
@@ -245,7 +245,7 @@ module Spree
         let!(:zone)        { create(:zone_with_member) }
         let!(:order)       { create(:order, bill_address: create(:address)) }
         let!(:line_item)   { create(:line_item, order: order) }
-        let(:tax_rate)     { create(:tax_rate, included_in_price: true, calculator: Calculator::FlatRate.new(preferred_amount: 0.1)) }
+        let(:tax_rate)     { create(:tax_rate, included_in_price: true, calculator: ::Calculator::FlatRate.new(preferred_amount: 0.1)) }
         let(:adjustment)   { line_item.adjustments(:reload).first }
 
         before do