Talk for undergraduates on why they should embrace testing

1. Testing Steve Loughran HP Laboratories June 9th, 2008

4. your code doesn't work

5. I know this because...

6. my code doesn't work

7. it's OK to write code that doesn’t work

8. but not to ship it

9. especially when it matters

10. how do you get from "broken" to "shipping"?

11. Device Drivers ship and see test it! Test-Driven  x:  y : f ( y , x) > 0 Formal Methods prove it works

14. Test Driven Development any feature without a test doesn’t exist

18. public class LessSimpleTest extends TestCase { public LessSimpleTest (String s) { super(s); } public void testAssignment() { final Date date = new Date(); Event event = new Event(UUID.randomUUID(), date, "now", "Text"); assertEquals("self equality failed", event, event); assertEquals(date, event.getDate()); assertNotNull(date.getID()); } }

19. swing GUI TestRunner

20. Ant-generated report scales better; reports published

21. Continuous Integration see: CruiseControl, Hudson, LuntBuild

22. ==> blame assignment whose change broke the build?

26. politics: resistance to change