Thanks!

I would like to thank the following people (listed alphabetically by name) for valuable feedback, suggestions, typo fixes and other contributions:

• Brad Appleton
• Borysław Bobulski
• Chris Kucharski
• Daniel Dec
• Daniel Żołopa (cover image)
• Donghyun Lee
• Łukasz Maternia
• Marek Radecki
• Martin Moene
• Michael Whelan
• Polina Kravchenko
• Rafał Bigaj
• Reuven Yagel
• Rémi Goyard
• Robert Pająk
• Wiktor Żołnowski

This book is not original at all. It presents various topics that others invented and I just picked up. Thus, I would also like to thank my mentors and authorities on test-driven development and object-oriented design that I gained most of my knowledge from (listed alphabetically by name):

• Amir Kolsky
• Dan North
• Emily Bache
• Ken Pugh
• Kent Beck
• Mark Seemann
• Martin Fowler
• Nat Pryce
• Philip Schwarz
• Robert C. Martin
• Scott Bain
• Steve Freeman