Make error test more robust

                let error_array = es.errors();

                assert_eq!(1, error_array.len());

                let err = error_array[0]

                    .data()

                    .expect("failed to retrieve verification error data");

                let err1 = err.replace(" self-", "self ");

                assert_eq!("Verify error:self signed certificate", err1);

                    .code();

                assert_eq!(err, 0);

            }

            _ => panic!("expected CMS verification error, got Ok()"),

        }