1. Chris George Website: www.mostly-testing.co.uk @ChrisG0911 Easing the pain of legacy tests

3. O nce upon a time…

4. Flagship product Over 250,000 lines of code Over 10,000 automated tests Tests run in virtual machines Multiple SQL Server versions Continuous Integration

5. The real story…

6. Many attempts to fix over the years == rising complexity == increasing instability

7. Myths, Preconceptions and Folklore

8. Don’t jump into the code…

9. Start with quick wins

10. Tests should clear up after themselves…

11. Exponential comparison… # objects# ComparisonsApprox time 101001 second 10010,0001.7 mins 10001,000,0002.7 hours!

12. By the end of the week - By the end of week 2 - only 1 failure! 95% passing

13. Discuss the problem/failure Pattern #1

14. Pair & Review Pattern #2

15. Pattern #3 Find and fix the quick wins

16. Pattern #4 De-mystify

17. Make best use of the skills on your team Treat test code the same as product code Don’t believe everything you hear Most problems are not hard Lessons learnt

18. Any Questions? Chris George Website: www.mostly-testing.co.uk @ChrisG0911