maven.xml

<project default="jar:jar">

  <postGoal name="java:compile">
    
    <copy todir="${maven.build.dir}/test-classes/org/apache/commons/digester">
      <fileset dir="src/test/org/apache/commons/digester">
        <include name="*.xml"/>
      </fileset>
    </copy>
    
  </postGoal>

</project>