tdd

Test-driven development prevents regressions by defining expected behavior in a failing test first, then applying minimal code changes to pass it before refactoring. This enforces disciplined incremental delivery and ensures stable, verified behavior.

The red-green-refactor loop is a test-driven development cycle where you write a failing test, make the smallest code change to pass it, and then refactor while maintaining a green test suite. This process drives thin-slice progression for new features.

Test-driven development is needed when implementing new software features that require regression coverage and clarity about expected outcomes before coding. It helps avoid fragile implementations by forcing you to define specific behaviors as tests.

Yes, test-driven development reduces complexity by moving forward one minimal capability at a time. This thin-slice progression approach converts specific behaviors into tests, eliminating ambiguity and ensuring your engineering workflow maintains a green test suite.

The best way to write tests first is to start by generating a failure test for the desired behavior, iterate with minimal code changes until it passes, and finally refactor without breaking the tests. This ensures regression protection and stable outcomes.

Writing production code before tests leads to unclear requirements because it skips defining expected behavior upfront. Test-driven development solves this by forcing you to specify expected outcomes in tests first, preventing fragile implementations and future regressions.