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in this video im going to take you through writing unit tests for existing code show you the kinds of things you encounter while doing that and how to solve them in a perfect world you would never have to write unit tests for existing code because you would be following test driven development where you write your tests along or even before you write the actual code but sometimes you have to deal with existing code thats not properly tested but again sometimes all of the time its good practice to add unit tests especially in that case because tests help you refactor your code and design it better so its easier to test and easier to change later on im going to show you a few examples of this today my goal with this channel is to help you make better software design decisions ive written a guide that provides you with a starting point its totally free you can get your copy at iamcodes.com design guide it contains the seven steps that i follow myself when i design a piece of softwa