TDD with JUnit: Installing JUnit

First we need to download the junit.jar.

Update your ivy.xml, so it looks like this:

 <ivy-module version="2.0">  
   <info organisation="org.confucius" module="helloworld"/>  
   <dependencies>  
           <dependency org="junit" name="junit" rev="4.10"/>            
           <dependency org="org.json" name="json" rev="20090211"/>  
     <dependency org="javax.servlet" name="servlet-api" rev="2.5"/>  
     <dependency org="javax.servlet" name="jsp-api" rev="2.0"/>  
     <dependency org="jstl" name="jstl" rev="1.2"/>  
         <dependency org="log4j" name="log4j" rev="1.2.16"/>   
   </dependencies>  
 </ivy-module>  

Now run the Ant 'resolve' target to download the juit.jar to your /lib folder.

Next, we need to add the junit.jar to our Eclipse Classpath.

Go to Project->Properties->Java Build Path->Libraries->Add Jars
and add the junit.jar

We also need to update the Ant Classpath.
Update your build.xml, like this:

 <project name="HelloWorld" xmlns:ivy="antlib:org.apache.ivy.ant" >  
   
   <target name="resolve" description="--> retrieve dependencies with ivy">  
     <ivy:retrieve />  
   </target>  
   
      <target name="init" depends="resolve">  
           <mkdir dir="classes"/>  
           <mkdir dir="target"/>  
      </target>  
   
      <target name="compile" depends="init">  
           <javac srcdir="." destdir="classes">  
                <classpath>  
                 <pathelement location="lib/junit-4.10.jar"/>  
                 <pathelement location="lib/json-20090211.jar"/>  
                 <pathelement location="lib/servlet-api-2.5.jar"/>  
                 <pathelement location="lib/jsp-api-2.0.jar"/>  
                 <pathelement location="lib/log4j-1.2.16.jar"/>  
                </classpath>  
           </javac>  
      </target>  
   
      <target name="dist" depends="compile">  
           <war destfile="target/HelloWorld.war" webxml="web.xml">  
                 <classes dir="classes"/>  
                 <lib dir="lib">  
                      <exclude name="jsp-api*.jar"/>  
                      <exclude name="servlet-api*.jar"/>  
                 </lib>       
                 <fileset dir="web-content"/>  
                 <webinf dir="WEB-INF"/>  
           </war>  
           <echo>Build executed at ${TIME_NOW}</echo>  
      </target>  
   
      <tstamp>   
           <format property="TIME_NOW" pattern="hh:mm:ss aa MM/dd/yyyy"/>   
      </tstamp>   
        
 </project>  

We are all set to write Junit tests.