TestSupport LogUtil

import org.apache.logging.log4j.Level;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.core.Appender;
import org.apache.logging.log4j.core.LoggerContext;
import org.apache.logging.log4j.core.appender.ConsoleAppender;
import org.apache.logging.log4j.core.config.AppenderRef;
import org.apache.logging.log4j.core.config.Configuration;
import org.apache.logging.log4j.core.config.LoggerConfig;
import org.apache.logging.log4j.core.layout.PatternLayout;

public class LogUtil {
    /**
     * Configures rootLogger + dedicated Logger by name for Unit Test classSetup
     */
    public static void configureTestLoggers(String unitLoggerName, Level unitLoggerLevel) {
        if (unitLoggerName != null) {
            if (unitLoggerLevel == null) {
                unitLoggerLevel = Level.INFO;
            }
            final LoggerContext ctx = (LoggerContext) LogManager.getContext(false);
            final Configuration config = ctx.getConfiguration();
            Appender appender = ConsoleAppender.createDefaultAppenderForLayout(PatternLayout.newBuilder()
                    .withPattern(PatternLayout.TTCC_CONVERSION_PATTERN)
                    .build());
            appender.start();
            config.addAppender(appender);
            LoggerConfig loggerConfig = config.getLoggerConfig(unitLoggerName);
            if (!loggerConfig.getName().equals(unitLoggerName)) {
                AppenderRef ref = AppenderRef.createAppenderRef(appender.getName(), null, null);
                AppenderRef[] refs = new AppenderRef[] { ref };
                loggerConfig = LoggerConfig.createLogger("false", unitLoggerLevel, unitLoggerName, "true", refs, null, config,
                        null);
                config.addLogger(unitLoggerName, loggerConfig);
            }
            loggerConfig.addAppender(appender, null, null);
            loggerConfig.setLevel(unitLoggerLevel);
            ctx.updateLoggers();
        }
    }

    /**
     * Configures rootLogger + dedicated Logger by name for Unit Test classSetup
     */
    public static void configureRootLogger(Level rootLoggerLevel) {
        org.apache.logging.log4j.core.Logger rootLogger = (org.apache.logging.log4j.core.Logger) LogManager.getRootLogger();
        Level level = Level.INFO; // default
        if (rootLoggerLevel != null) {
            level = rootLoggerLevel;
        }

        final LoggerContext ctx = (LoggerContext) LogManager.getContext(false);
        final Configuration config = ctx.getConfiguration();
        LoggerConfig loggerConfig = config.getLoggerConfig(rootLogger.getName());
        loggerConfig.setLevel(level);

        if (rootLogger.getAppenders().isEmpty()) {
            Appender appender = ConsoleAppender.createDefaultAppenderForLayout(PatternLayout.newBuilder()
                    .withPattern("%d [%-5p] %-45.45c - %m%n")
                    .build());
            appender.start();
            config.addAppender(appender);
            loggerConfig.addAppender(appender, null, null);
        }
        ctx.updateLoggers();
    }