What you define as "unit test" in your post are actually mere assertions. They are helpful to ensure the sound state of your internal code but not for documenting and ensuring that your code behaves correctly as expected (as in a unit test). So, I'm not saying that assertions in code are useless, I'm saying that it's not unit testing! moreover an unit test has usually multiple assertions because the goal is to thest a method (the unit) under different scenarios!
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