update solidus behaviour for record not found

spec/controllers/spree/products_controller_spec.rb

@@ -8,9 +8,9 @@
     let!(:store) { FactoryBot.create(:store) }
 
     it 'returns 404' do
-      get :show, params: { :id => product.to_param }
-
-      expect(response.response_code).to eq 404
+      expect {
+        get :show, params: { :id => product.to_param }
+      }.to raise_error(ActiveRecord::RecordNotFound)
     end
   end
 
@@ -25,9 +25,10 @@
 
     it 'returns 404' do
       allow(controller).to receive_messages(:current_store => store_2)
-      get :show, params: { :id => product.to_param }
 
-      expect(response.response_code).to eq 404
+      expect {
+        get :show, params: { :id => product.to_param }
+      }.to raise_error(ActiveRecord::RecordNotFound)
     end
   end