Question : is junit used in eclipse

I'm reading "Eclipse IDE Pocket Guide" to learn Eclipse.  I got to "Chapter 5.  Unit Testing with JUnit".  They write a factorial program and use JUnit to test that it works right.  I followed along but when I add a JUnit test case, it has errors with:

1) import junit.framework.TestCase;
2) public void testFactorial extends TestCase
3) assertEquals( 1.0, Factorial.factorial(1), 0.0 );

It red underlines:
1) junit
2) void
3) all the function arguments

If I hover over the red underlines, it says:
1) the import junit cannot be resolved
2) Syntax error on token "void", interface expected
3) Syntax error on tokens, AnnotationName expected instead.

QUESTION: Is JUnit still used?  The book is copy-written 2005.  Is that what is going wrong above?  I don't know Eclipse and I'm also worried that I've neglected some important files somehow.

Answer : is junit used in eclipse

Read this link - http://ubuntuforums.org/showthread.php?t=465242
Should sort out your problems