test-driven-development

Test-driven development in Python starts by writing a failing pytest before any production code, delivering the minimal implementation to pass it, then refactoring while keeping tests green. This enforces a test-first workflow.

The red-green-refactor cycle is a mandatory test-first workflow: write a failing test, implement the minimal code to make it pass, then refactor safely while maintaining green tests.

Writing tests first improves software quality by providing early feedback through failing tests that guide design, interfaces, and edge-case handling, preventing undetectable regressions and unclear requirements.

Yes, the test-first workflow applies to feature development, bug fixes, and refactors across software projects, ensuring production code is always guided by failing tests and maintaining well-documented behavior.

The best way to prevent regressions is adopting a test-first workflow, writing a failing test before implementation to ensure safer code evolution and maintainable, well-documented behavior.

Pytest-driven workflows are emphasized for Python environments, but the core test-driven development process requires writing a failing test first, making it adaptable across different software testing frameworks.