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Test Automation Unit Testing involves the practice of writing and running automated tests at the individual component level to ensure that each unit of code behaves as expected. This process helps identify bugs and errors early in the development cycle, allowing for faster and more efficient debugging. Unit tests are typically written by developers themselves to verify the correctness of their code and ensure that new changes do not introduce regressions. By automating these tests, developers can run them frequently and consistently, providing confidence in the reliability and quality of their software.