Are tests not enough documentations? In addition I got lot of devs saying "well you wouldn't need test if you just code better and you'd code better if you understand every single little thing in the system like I did". :\
In my opinion, it should be basic documentation for the project with the project description + architecture, setup, run, and deployment. Truly understanding of the project comes during the work on it.
Some developers might be lazy to cover the software with tests and they are looking for excuses not to learn it 🙈
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