What is a Unit in Unit Testing?

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What is a Unit in Unit Testing? Sometimes I miss the adrenaline of decompiling a jar file (because the source was lost ages ago), adding a feature and putting it back in production. But, believe me, those days sucked. In the bad old days, people pushed to production without any kind of automated testing. We would just build the features needed, tested locally and copied the files manually to a server, usually after midnight, accompained by pizzas and fear.