They are a safety net - it means that you can refactor the code (e.g. split or merge classes or functions) and tests still pass. If you can’t refactor anything without breaking the tests, something is not right.
Андрей Ставицкий (Редактор отдела «Наука и техника»)
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Hugo's birth at Queen Charlotte's and Chelsea Hospital, London, felt like "a miracle", Bell says