Downloading, 
"installing" (well, in this directory anyway), 
and testing JUnit :

 $ which java
 /usr/local/bin/java
 $ java -version
 java version "1.5.0_06"
 Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_06-b05)
 Java HotSpot(TM) Client VM (build 1.5.0_06-b05, mixed mode, sharing)

 $ wget http://umn.dl.sourceforge.net/sourceforge/junit/junit3.8.1.zip
 $ unzip junit3.8.1.zip
 $ cd junit3.8.1
 $ export CLASSPATH=$CLASSPATH:`pwd`/junit.jar:`pwd`/src.jar
 $ cd ..

Here's the test :

 $ java junit.textui.TestRunner junit.samples.AllTests
 .........................................
 .........................................
 .....................................
 Time: 0.712
 
 OK (119 tests)

And here's the graphical test thingy.
(Works under X11 if cs command line is from "ssh -X user@cs".)

 $ java junit.swingui.TestRunner junit.samples.AllTests 

# ------------------------------------------------------

And here's my example tests, all in the default (unnamed) package.

 $ javac *.java
 $ java RunBinarySearch
 bs.one is '1'
 $ java TestBinarySearch
 ..F
 Time: 0.007
 There was 1 failure:
 1) testThatItsZero(TestBinarySearch)junit.framework.AssertionFailedError
 	at TestBinarySearch.testThatItsZero(TestBinarySearch.java:37)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at TestBinarySearch.main(TestBinarySearch.java:19)

 FAILURES!!!
 Tests run: 2,  Failures: 1,  Errors: 0


# -------------------------------------------------------

Finally, let's make sure that these versions are saved.

 $ mkdir BS_versions
 $ mkdir BS_versions/feb17
 $ cp *.java BS_versions/feb17

# -------------------------------------------------------

In class : 

 * implement Programming Perl's stuff in java, 
   using this test framework