test-driven-development

Test-driven development is a workflow where you write a failing test first, implement minimal code to pass it, then refactor while keeping tests green. This enforces a test-first approach to reduce defects and ensure verifiable changes.

To start test-driven development in Python, write a failing test that defines the desired behavior, validate the failure, implement the minimal code required to pass the test, and then refactor the code while keeping the test suite green.

Yes, test-driven development applies to UI tasks and bug fixes across codebases. By writing failing tests before coding, you clarify intent, prevent regression, and guide safer changes for new features and refactoring.

Enforcing a test-first workflow reduces defects by ensuring failing tests are written before implementation. This approach improves design decisions, validates behavior immediately, and increases confidence in safer, verifiable changes.

Test-driven development supports cross-language and multi-module projects by clarifying intent and preventing regression. The red-green-refactor cycle ensures robust behavior across different codebases through verifiable changes.