src/test/resources/test-jul-config.xml

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<configuration>
  <newRule pattern="*/configuration/osgi"
           actionClass="org.apache.sling.commons.log.logback.OsgiAction"/>
  <osgi/>

  <appender name="CONSOLE" class="ch.qos.logback.core.ConsoleAppender">
    <encoder>
      <pattern>%d{dd.MM.yyyy HH:mm:ss.SSS} *%level* [%thread] %logger %message%n</pattern>
    </encoder>
  </appender>

  <appender name="FILE" class="ch.qos.logback.core.FileAppender">
    <file>${sling.home}/logs/testjul.log</file>
    <encoder>
      <pattern>%d %-5level %logger{35} - %msg %n</pattern>
    </encoder>
  </appender>

  <logger name="foo.jul.1" level="TRACE"/>

  <root level="INFO">
    <appender-ref ref="CONSOLE" />
    <appender-ref ref="FILE" />
  </root>
</configuration>