ant/src/etc/testcases/taskdefs/replace.xml

<?xml version="1.0"?>

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

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

  <target name="test2">
    <replace file=""/>
  </target>

  <target name="test3">
    <replace file="template.xml"/>
  </target>

  <target name="test4">
    <replace file="template.xml" token=""/>
  </target>

  <target name="test5">
    <replace file="template.xml" 
             token="dont_want_to_really_replace_something"/>
  </target>

  <target name="test6">
    <replace file="template.xml">
      <replacefilter />
    </replace>
  </target>

  <target name="test7">
    <replace file="template.xml">
      <replacefilter token="" />
    </replace>
  </target>

  <target name="test8">
    <replace file="template.xml">
      <replacefilter token="dont_want_to_really_replace_something" />
    </replace>
  </target>

  <target name="test9">
    <copy file="replace/source.txt" tofile="replace/output.txt"/>
    <loadfile srcFile="replace/value.txt" property="content"/>
    <replace file="replace/output.txt" token="@@@Replace this@@@" value="${content}"/>
  </target>

  <target name="cleanup">
      <delete file="replace/output.txt" quiet="true"/>
  </target>
</project>