tdd

Test-driven development is a methodology where you write tests before implementation to improve software quality and maintainability. It enforces developer discipline through structured testing cycles, ensuring robust code delivery.

To implement a new feature using test-driven development, begin by writing a failing test for the desired functionality. Then, write the minimal code required to pass the test, and finally refactor the implementation for robustness.

The red-green-refactor cycle is a core test-driven development technique where you first write a failing test (red), implement minimal code to make it pass (green), and then clean up the codebase (refactor) without changing behavior.

Test-driven development focuses only on testing public interfaces rather than private implementation details. This approach supports incremental software delivery and allows internal refactoring without breaking existing tests.

Vertical slicing is used in test-driven development to deliver incremental software features end-to-end. It allows developers to build and test thin, functional slices of an application, ensuring each layer works correctly before expanding.

Test-driven development significantly aids refactoring by providing a safety net of automated tests. After achieving a passing test, developers can confidently restructure code to improve design and maintainability without introducing regressions.