JUnit.org Resources for Test Driven Development

In the Path for Environmental Variables I have:
%JUNIT_HOME%;C:\junit4.6\junit-4.6.jar;C:\junit4.6

#3 of the install instructions said "Test the installation by running java org.junit.runner.JUnitCore org.junit.tests.AllTests" and I got this:

C:\>java org.junit.runner.JUnitCore.org.junit.tests.AllTests
Exception in thread "main" java.lang.NoClassDefFoundError: org/junit/runner/JUnitCore
Caused by: java.lang.ClassNotFoundException: org.junit.runner.JUnitCore
at java.net.URLClassLoader$1.run
at java.security.AccessController.doPrivileged
at java.net.URLClassLoader.findClass
at java.lang.ClassLoader.loadClass
at sun.misc.Launcher$AppClassLoader.loadClass
at java.lang.ClassLoader.loadClass
at java.lang.ClassLoader.loadClassInternal

C:\>