StyledTextOutputEvent event = Mock()
        StyledTextOutputEvent transformed = Mock()

        when:
        listener.onOutput(event)

        then:
        1 * event.withLogLevel(LogLevel.LIFECYCLE) >> transformed
        1 * target.onOutput(transformed)
        0 * target._
    }

    def doesNotChangeLogLevelWhenEventAlreadyHasALogLevel() {
        StyledTextOutputEvent event = Mock()

        if (textOutputEvent.getLogLevel() != null) {
            listener.onOutput(textOutputEvent);
        } else {
            listener.onOutput(textOutputEvent.withLogLevel(logLevel.get()));
        }
    }

            builder.append("</");
            builder.append(span.style);
            builder.append(">");
        }
        return builder.toString();
    }

    public StyledTextOutputEvent withLogLevel(LogLevel logLevel) {
        return new StyledTextOutputEvent(getTimestamp(), getCategory(), logLevel, getBuildOperationId(), spans);
    }

    @Override