src/etc/testcases/taskdefs/taskdef.xml

<?xml version="1.0"?>

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

  <target name="test1">
    <taskdef/>
  </target>

  <target name="test2">
    <taskdef name=""/>
  </target>

  <target name="test3">
    <taskdef classname=""/>
  </target>

  <target name="test4">
    <taskdef name="" classname="oops"/>
  </target>

  <target name="test5">
    <taskdef name="test" classname="org.apache.tools.ant.Project" />
  </target>

  <target name="test6">
    <echo message="${build.test}" />
    <taskdef name="test6"
             classname="org.apache.tools.ant.taskdefs.TaskdefTestSimpleTask" />
    <test6>
      <echo message="worked" />
    </test6>
  </target>

  <target name="test7">
    <taskdef name="test7"
             classname="org.apache.tools.ant.taskdefs.TaskdefTestContainerTask" />
    <test7>
      <echo message="worked" />
    </test7>
  </target>

</project>