build.xml

<?xml version="1.0"?>
<project default="demo">

	<taskdef resource="testngtasks" classpath="lib/testng-re-html.jar" />

	<path id="cpath">
		<fileset dir="lib">
			<include name="*.jar" />
			<include name="**/*.jar"/>
		</fileset>
	</path>

	<path id="runpath">
		<pathelement location="bin" />
		<path refid="cpath" />
	</path>

	<target name="compile">
		<delete dir="bin" />
		<mkdir dir="bin" />
		<javac destdir="bin" classpathref="cpath" srcdir="src" debug="true" encoding="UTF8">
		</javac>
		<copy file="src/log4j.properties" tofile="bin/log4j.properties" />
	</target>

	<target name="demo" depends="compile">
		<delete dir="test-output" />
		<mkdir dir="test-output" />
		<testng outputDir="test-output" classpathref="runpath" >
			<xmlfileset dir="test-xml" includes="demo.xml" />
		</testng>
	</target>

</project>