Simple build.xml for toy java-projects, to have ability to unit-test it via command-line.

build.xml

<?xml version="1.0" encoding="UTF-8"?>

<!--
 build.xml with dead-simple project structure and ability to use JUnit.
 This build.xml provides next directories structure:
 .
 ├── build
 │   ├── main
 │   │   └── SomeClass.class
 │   └── test
 │       └── SomeClassTest.class
 ├── build.xml
 ├── lib
 │   ├── junit.jar
 │   └── some_other.jar
 └── src
    ├── main
    │   └── SomeClass.java
    └── test
        └── SomeClassTest.java
 
 Put junit.jar and other required jars into lib/ folder.
 Run with unit-tests:
 $ ant
-->

<project name="NameForProject" basedir="." default="default">

    <property name="build.dir" value="build"/>
    <property name="src.dir" value="src"/>

    <property name="main.dir" value="${src.dir}/main"/>
    <property name="main.classes.dir" value="${build.dir}/main"/>
    <property name="main.lib.dir" value="lib"/>

    <property name="test.dir" value="${src.dir}/test"/>
    <property name="test.classes.dir" value="${build.dir}/test"/>
    <property name="test.lib.dir" value="lib"/>

    <path id="main.classpath">
        <pathelement location="${main.classes.dir}"/>
        <fileset dir="${main.lib.dir}">
            <include name="**/*.jar"/>
            <exclude name="**/junit*.jar"/>
        </fileset>
    </path>

    <path id="test.classpath">                            
        <path refid="main.classpath"/>
        <pathelement location="${test.classes.dir}"/>
        <fileset dir="${test.lib.dir}">
            <include name="**/junit*.jar"/>
        </fileset>
    </path>

    <available file="${build.dir}" property="buildDirExists"/>

    <target name="clean" description="remove all generated artifacts" if="buildDirExists">
        <delete dir="${build.dir}" includeEmptyDirs="true"/>
    </target>

    <target name="create" description="create the build directories" unless="buildDirExists">
        <mkdir dir="${main.classes.dir}"/>
        <mkdir dir="${test.classes.dir}"/>
    </target>

    <target name="compile" description="compile all .java source files" depends="create">
        <javac srcdir="${main.dir}" destdir="${main.classes.dir}" debug="on" includeantruntime="no">
            <classpath refid="main.classpath"/>
            <include name="**/*.java"/>
            <exclude name="**/*Test.java"/>
        </javac>
        <javac srcdir="${test.dir}" destdir="${test.classes.dir}" debug="on" includeantruntime="no">
            <classpath refid="test.classpath"/>
            <include name="**/*Test.java"/>
        </javac>
    </target>

    <target name="test" description="run all JUnit tests" depends="compile">
        <junit printsummary="on" haltonfailure="yes" showoutput="yes">
            <classpath refid="test.classpath"/>
            <formatter type="brief" usefile="false" />
            <batchtest fork="yes">
                <fileset dir="${test.dir}">
                    <include name="**/*Test.java"/>
                </fileset>
            </batchtest>
        </junit>
    </target>

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