test-driven-development

Test-driven development implements behavior changes by driving code with failing tests and verifying outcomes with explicit evidence. The Red-Green-Refactor methodology ensures new features and bug fixes meet specific, testable requirements through a structured test-first approach.

Red-Green-Refactor is a test-first methodology preventing regressions by writing failing tests, making them pass, and refining the code. It ensures verifiable behavior for features and bug fixes, catching unintended side effects early in the development cycle.

To start, define clear behavior targets and write a failing test before any production code. Execute test framework commands with file path context to verify the failure, then implement the feature logic until the test passes with explicit evidence.

Yes, this test-first approach applies to both new feature implementation and bug fixing requiring regression-proof behavior validation. It ensures code meets specific, testable requirements and reduces unintended side effects across both scenarios.

Executing behavior verification requires clear behavior targets, test framework commands, and file path context. These inputs drive the Red-Green-Refactor cycle, allowing the methodology to verify code changes with explicit evidence.

Behavior-driven development focuses on failing tests first to ensure code meets specific, testable requirements and to prevent regressions. This structured approach validates behavior changes with explicit evidence before implementation logic is finalized.