|I find a significant portions of the "bugs" I make come from making the wrong assumptions
True. OTOH, I find that writing tests forces me to codify and explicitly state my assumptions (even if not in a form the typical end-user would understand), which, in turn, forces me to think about and identify those assumptions.
By making me consciously aware of my assumptions, it serves as a first step towards finding and correcting those which are incorrect. It can also prove useful in implementing the correct behaviours once incorrect assumptions are identified - fixing the tests, if they are well-written, often clarifies what the code needs to do differently.
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