How do you know what to test when you don't even know how to write the code that you need to test? This is a paradox that many developers find themselves in daily.

In this episode Donn talks about his strategy for dealing with unknowns in programming, namely around testing and how to figure out how to write tests for new code that might be difficult, unfamiliar or even legacy code.

Square has SDKs and APIs to make payments and run a business. Even better, Square has a new YouTube channel for developers! Check out Square's new YouTube Channel for Developers at youtube.com/squaredev and let them know you heard about it from us.

Learn UX/UI design flatironschool.com/fragmented in 24 weeks and discover our global community on campus or online and go back to school with Flatiron School! flatironschool.com/fragmented!

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See you in class!