diff --git a/build.xml b/build.xml
index ee3ab90..46cfdad 100644
--- a/build.xml
+++ b/build.xml
@@ -1,20 +1,26 @@
 <?xml version="1.0"?>
-<project>
+<project name="HelloWorld" basedir="." default="main">
 
   <property name="src.dir" value="src"/>
   <property name="build.dir" value="build"/>
   <property name="jar.dir" value="${build.dir}/jar"/>
   <property name="classes.dir" value="${build.dir}/classes"/>
+  <property name="lib.dir" value="lib"/>
 
   <property name="main-class" value="hbb.HelloWorld"/>
 
+  <path id="classpath">
+    <fileset dir="${lib.dir}" includes="**/*.jar"/>
+  </path>
+  <path id="application" location="${jar.dir}/${ant.project.name}.jar"/>
+
   <target name="clean">
     <delete dir="${build.dir}"/>
   </target>
 
   <target name="compile">
     <mkdir dir="${classes.dir}"/>
-    <javac srcdir="src" destdir="${classes.dir}"/>
+    <javac srcdir="src" destdir="${classes.dir}" classpathref="classpath"/>
   </target>
 
   <target name="jar" depends="compile">
@@ -27,7 +33,24 @@
   </target>
 
   <target name="run" depends="jar">
-    <java jar="${jar.dir}/HelloWorld.jar" fork="true"/>
+    <java fork="true" classname="${main-class}">
+      <classpath>
+        <path refid="classpath"/>
+        <path location="${jar.dir}/${ant.project.name}.jar"/>
+      </classpath>
+    </java>
+  </target>
+
+  <target name="junit" depends="jar">
+    <junit printsummary="yes">
+      <classpath>
+        <path refid="classpath"/>
+        <path refid="application"/>
+      </classpath>
+      <batchtest fork="yes">
+        <fileset dir="${src.dir}" includes="**/*Test.java"/>
+      </batchtest>
+    </junit>
   </target>
 
   <target name="clean-build" depends="clean,jar"/>
diff --git a/lib/.gitkeep b/lib/.gitkeep
new file mode 100644
index 0000000..e69de29
diff --git a/lib/junit-4.13.2.jar b/lib/junit-4.13.2.jar
new file mode 100644
index 0000000..6da55d8
Binary files /dev/null and b/lib/junit-4.13.2.jar differ
diff --git a/src/hbb/HelloWorldTest.java b/src/hbb/HelloWorldTest.java
new file mode 100644
index 0000000..2eb6f1e
--- /dev/null
+++ b/src/hbb/HelloWorldTest.java
@@ -0,0 +1,18 @@
+package hbb;
+
+import org.junit.Test;
+
+import static org.junit.Assert.fail;
+
+public class HelloWorldTest {
+
+    @Test
+    public void testNothing() {
+    }
+
+    @Test
+    public void testWillAlwaysFail() {
+        fail("An error message");
+    }
+
+}