Add spec to countries_controller

spec/controllers/spree/admin/countries_controller_spec.rb

@@ -0,0 +1,24 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+module Spree
+  module Admin
+    describe CountriesController, type: :controller do
+      include AuthenticationWorkflow
+
+      describe "#update" do
+        before { login_as_admin }
+
+        it "updates the name of an existing country" do
+          country = create(:country)
+          spree_put :update, id: country.id,
+                             country: { name: "Kyrgyzstan" }
+
+          expect(response).to redirect_to spree.admin_countries_url
+          expect(country.reload.name).to eq "Kyrgyzstan"
+        end
+      end
+    end
+  end
+end