[esics6A]

The simple verification aspect of unit tests makes writing code easier and more purposeful in my opinion. At a most basic level it's kind of like a small informal proof. When the code base get's complex and larger in size this is invaluable if unit tests are written correctly. Tests have to make sense and be written well just like any other piece of code.

It also helps form thinking about test cases and logic before writing code. Before I used exhaustive unit tests I would just start writing code right away and often times this would result in constant refactoring as the code evolved or during debugging. But unit tests encouraged me to scaffold out abstract functions and write tests before implementing the code. It got me thinking about what the logic and workflows then implementing the functions meant having the tests pass as verification.