Unit Testing
Unit testing checks one small, observable behavior automatically, with the code and its dependencies controlled so failures point to a clear rule. It gives you fast feedback before broader integration tests exercise real systems.
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Intro
Unit Testing
Unit testing is an automated check of one small behavior. You set up a known condition, invoke that behavior, and let an assertion decide whether the observed result matches the contract. The goal is evidence you can run repeatedly while changing code.
A useful unit test is fast, isolated, repeatable, and self-checking. Keep real infrastructure outside its boundary. A database, filesystem, network, clock, or random source can make a test slower or nondeterministic. Test that boundary separately when the boundary itself is the risk.
Start with behavior
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