src/etc/testcases/types/mapper.xml

<?xml version="1.0"?>

<project name="copy-test" basedir="." default="test1">

  <target name="test1">
    <delete dir="copytest" />
    <mkdir dir="copytest" />
    <copy todir="copytest">
      <fileset dir="../../../main">
        <include name="**/taskdefs/*.java" />
      </fileset>
      <fileset dir="../../../testcases">
        <include name="**/taskdefs/*.java" />
      </fileset>
      <mapper type="flatten" />
    </copy>
  </target>

</project>