Test-Driven Development (TDD) is an iterative software development process where you write automated tests before writing the actual production code. It follows the Red-Green-Refactor cycle:
Red: Write a small unit test that fails because the feature does not exist yet.
Green: Write the minimum amount of production code required to make that test pass.
Refactor: Clean up both the production code and the test code while ensuring all tests stay green.
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