The document discusses the effort developers allocate to software testing, highlighting that testing constitutes approximately 50% of project effort based on historical references. It presents a histogram indicating that many students spend only 4% of their time on testing, with an estimated 27% actually dedicating time to it. Additionally, the document includes information about code changes and test executions, leading to insights on the testing behavior of developers.

1. How (Much) Do Developers
Test?
Moritz Beller
@Inventitech
Andy Zaidman
Georgios Gousios

3. 50%
… of Project Effort
Software Testing takes ...

4. 50%
… of Project Effort
Brooks, 1975
Software Testing takes ...

8. Testing means all things to all men

10. How (Much)
Do You
Test?

20. 40

21. 4.2 yr

22. OMG!!!

23. Histogram of Testing Time

24. Histogram of Testing Time
50% of students test only 4% of their
time, or less

27. Estimated 27%

28. Estimated 27%
Reality 9%

30. >1,300

32. Estimated 48%

33. Estimated 48%
Reality 25%

35. @Inventitech
Moritz Beller, TU Delft
How (Much) Do Developers Test?
TestRoots.org

36. @Inventitech
Moritz Beller, TU Delft
How (Much) Do Developers Test?
TestRoots.org
Code Changes
~
Test Executions

37. @Inventitech
Moritz Beller, TU Delft
How (Much) Do Developers Test?
TestRoots.org
Code Changes
~
Test Executions

38. @Inventitech
Moritz Beller, TU Delft
How (Much) Do Developers Test?
TestRoots.org
Code Changes
~
Test Executions

39. @Inventitech
Moritz Beller, TU Delft
How (Much) Do Developers Test?
TestRoots.org
Code Changes
~
Test Executions
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