src/test/resources/com/puppycrawl/tools/checkstyle/main/InputMainConfig-multi-thread-mode.xml

<?xml version="1.0"?>
<!DOCTYPE module PUBLIC
          "-//Puppy Crawl//DTD Check Configuration 1.3//EN"
          "http://checkstyle.sourceforge.net/dtds/configuration_1_3.dtd">

<module name="com.puppycrawl.tools.checkstyle.internal.testmodules.TestRootModuleChecker">
  <property name="property" value="test" default="test"/>
  <module name="Checker">
    <module name="TreeWalker">
    </module>
  </module>
</module>