test-driven-development

Test-driven development requires writing a minimal failing test that demonstrates intended behavior first. You confirm the test fails for the right reason, implement only enough production code to make it pass, then refactor while keeping tests green.

The red green refactoring cycle in TDD involves writing a failing test, implementing minimal code to pass it, and refactoring safely. This enforces strict test-first discipline and prevents over-engineering by verifying explicit failure and success states.

Avoid mocking anti-patterns by testing real behavior instead of verifying mock existence. Proper test strategy ensures tests validate actual functionality rather than testing the mock framework itself, keeping unit tests reliable across backend and frontend workflows.

TDD applies to refactoring existing code and fixing regression bugs across backend, frontend, and smart-contract workflows. You write a failing test reproducing the bug, verify the failure, then implement the smallest code change to make it pass.

The best way to enforce test-first discipline is applying strict quality guardrails that prohibit production code without a failing test. This prevents regressions and hidden bugs by forcing developers to prove expected behavior before implementation.

Test-driven development should not be skipped for convenience or rationalized as unnecessary just once. It is essential for new functionality, regression fixes, and refactoring where behavior must be verified, ensuring software quality and preventing hidden bugs.