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Unit testing isolates individual software components to verify correctness and detect regressions early. Tests are automated, fast, and designed to run frequently during development and in CI pipelines. Effective unit testing improves design by encouraging modular code and provides quick feedback to developers.
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Unit testing automatically checks small, isolated program units against expected behavior.
The approach grew from modular software development and spread through Extreme Programming and test-driven development. JUnit made automated unit tests accessible across many languages.
Give a small unit controlled inputs and check its result and side effects.
Unit tests protect a small unit in isolation.
Controlled inputs and expected results expose deviations.
Run tests automatically on every change.
Unit testing protects logic from regressions and provides fast feedback.
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