then:
        1 * listener.onOutput({ it instanceof LogLevelChangeEvent && it.newLogLevel == LogLevel.WARN })
        1 * listener.onOutput({ it.spans[0].text == withEOL('info') })
        original.toString() == ''
        0 * listener._
    }

    private String withEOL(String value) {
        return String.format('%s%n', value)
    }