Definition:Test-Driven Development (TDD)
Test-Driven Development (TDD) is a software engineering discipline where automated tests are written before writing production code.
Detailed Technical Explanation
Business Perspective
Dramatically reduces software regressions, ensuring long-term feature changes do not break legacy functionality.
Technical Perspective
Encourages modular code design and high unit test coverage across critical domain algorithms.
Real-World Example
Writing automated tests for payroll tax deduction calculations before writing the calculation algorithm in Node.js.
Common Architectural Mistakes
- ✗Testing Implementation Details: Writing fragile unit tests coupled to private internal methods rather than public module contracts.
Ecosystem Integration
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Frequently Asked Questions
Does TDD slow down development?
TDD slightly increases initial sprint time but drastically reduces bug debugging and refactoring costs long-term.
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