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Re:Ask HN: Codebase at my work is a complete mess, what should I do? on Thursday August 23, 2018 @07:39AM (#17826346)
> I started "repairing" the project but there're no tests to check whether my adjustments are correct.

I'm so frustrated and depressed by it.

If you were to apply TDD to this, you would begin by writing a test verifying existing code, then you will piece-by-piece rewrite it and use your tests to make sure you didn't break stuff.