Software Testing Agency

Hello PH! I've been programming for a long time now and throughout the years my main goal was to write clean and testable code. Nowadays, besides working as a freelance developer, my main focus is to help companies write tests for their excellent software. To give back to the community which I've learned my craft from, I've decided to offer free consulting services for all struggling with writing more serious tests. The most interesting scenarios will be combined into an ebook alongside with solutions! Feel free to email me with your issue and I'll try to help

What testing libraries/utilities do you use?