Testfirst development

1
Test-first development

• If a class does not have automatic tests, you
  must assume it does not work
• Regression testing tests retain value
• JUnit (Beck Gamma)
• industrial-strength regression testing for
  the common man

2
JUnit

• Small, easy to learn, easy to use, effective
• Java classes
• TestCase, Suite, runners
• 15 other language implementations
• http//www.junit.org
• http//www.xprogramming.com/software.htm

3
JUnit Test Class

• One test method per target method
• test anything that can break
• dont test anything that cant
• Can we give better guidance?
• Can we systematically produce consistent and
  complete test classes?