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A small test for one function, component, or module in isolation.
Unit tests are fast and precise. They are best for rules, transformations, validators, and edge cases that should not require a full app to verify.
Plainly
Think of Unit Test as a simple recipe for doing the work better. A small test for one function, component, or module in isolation.
In practice
Use it when you need a repeatable method instead of guessing from vibes. In practice, define the owner, input, output, and failure mode before you rely on it.