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.
Hoot: Fibers and
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截至记者发稿，洛阳钼业股价报17.92元/股，上涨1.93%。今年以来，公司股价累计上涨近180%。