SmallTalk test Unit framework

http://www.iam.unibe.ch/~ducasse/WebPages/Programmez/OnTheWeb/Eng-Art8-SUnit-V1.pdf

http://www.eli.sdsu.edu/courses/fall02/cs580/notes/testing/testing.html#Heading6 how to use SUnit

TestDrivenDevelopment

http://www.artima.com/suiterunner/tutorial.html

http://www.xprogramming.com/testfram.htm  Kent Beck's Original TestingFramework Paper