Force reload to truncate subseconds

Author: mshibuya

spec/integration/config/show/rails_admin_config_show_spec.rb

@@ -22,7 +22,7 @@ def do_request
     end
 
     it 'contains the JSONified object' do
-      expect(JSON.parse(body)).to eq JSON.parse @player.to_json
+      expect(JSON.parse(body)).to eq JSON.parse @player.reload.to_json
     end
   end