Explain the concept of test-driven development (TDD) and how it impacts the QA process.
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Start by defining test-driven development as a software development approach where tests are written before the actual code. Discuss the core tdd cycle: write a failing test, write code to make the test pass, then refactor the code for optimization. Explain how tdd ensures clearer requirements, fewer defects, and easier maintenance. Highlight how it shifts the qa process towards proactive defect prevention rather than reactive defect detection, potentially reducing the number of traditional post-development qa tasks.
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