test-driven-development

To enforce Test-Driven Development principles, you mandate writing failing tests before any production code and strictly verify failures through the Red-Green-Refactor cycle. This ensures code quality and prevents regressions across all development tasks.

The Red-Green-Refactor cycle in Test-Driven Development is a core loop where you first write a failing test, implement the minimum code to make it pass, and then refactor. This process ensures strict verification of test failures and successes.

To write tests first for bug fixes and refactoring, you begin by writing a failing test that reproduces the bug or validates the desired structure. You then implement the production code changes strictly to make that failing test succeed.

You can use Test-Driven Development for all software development tasks, including new features, bug fixes, and refactoring. The process mandates writing failing tests before implementation regardless of the specific development context.

Writing tests before implementation prevents regressions in agile development by enforcing strict verification of expected behaviors upfront. The Test-Driven Development process requires confirming test failures initially and successes after writing the exact implementation code.