build.xml

<project name="testprj" default="build">
  <target name="build" depends="test"/>

  <target name="test">
    <phpunit haltonfailure="true" printsummary="true">
      <batchtest>
        <fileset dir=".">
          <include name="*Test.php"/>
        </fileset>
      </batchtest>
    </phpunit>
  </target>

  <target name="ctest">
    <adhoc-task name="watch"><![CDATA[
      $fd = inotify_init();

      $wd = inotify_add_watch($fd, '.', IN_MODIFY);

      while($events = inotify_read($fd)){
        $aInterestedEvents = array_filter(
          $events,
          function($item){ 
             return preg_match("/\.php$/", $item['name']);
          });
        if(!empty($aInterestedEvents)){
          inotify_rm_watch($fd, $wd);
          passthru("phing test");
          $wd = inotify_add_watch($fd, '.', IN_MODIFY);
        }
      }

    ]]>
    </adhoc-task>
  </target>
</project>