Test-Driven Development
Test-Driven Development (TDD)
The Fundamental Rule
NO PRODUCTION CODE WITHOUT A FAILING TEST FIRST.
This is non-negotiable. Code written before tests must be deleted and rewritten with tests first.
Why TDD Matters
Testing after implementation provides false confidence:
- Tests pass immediately (proves nothing)
- No verification that tests catch regressions
- Untested edge cases slip through
TDD ensures every line of production code is proven necessary by a failing test.
The RED-GREEN-REFACTOR Cycle
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