src/etc/testcases/taskdefs/gunzip.xml

<?xml version="1.0"?>

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

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

  <target name="test2">
    <gunzip src=""/>
  </target>

  <target name="test3">
    <gunzip src="gzip.tmp"
            dest="gzip.tmp2"/>
  </target>

</project>