add a test case to verify presence of registration_ip_address for staged users

spec/controllers/users_controller_spec.rb

@@ -1045,6 +1045,7 @@ describe UsersController do
         result = ::JSON.parse(response.body)
         expect(result["success"]).to eq(true)
         expect(User.find_by_email(staged.email).staged).to eq(false)
+        expect(User.find_by_email(staged.email).registration_ip_address).to be_present
       end
     end