tsdd

Executable tests serve as living specifications by documenting system behavior through test cases, reducing divergence between code and documentation. This methodology ensures requirements remain synchronized with implementation as the codebase grows.

Test-Driven Development methodology is implemented by writing tests that define expected behavior before code creation, enforcing discipline and reliable code growth. This approach systematically guides feature implementation while maintaining test-based documentation.

Writing tests first improves code quality by establishing a durable specification that validates correctness and enforces TDD discipline. This practice ensures code maintainability by keeping behavior documentation executable and preventing regression during development.

You can document user login validation by writing tests that confirm specific behaviors, such as rejecting invalid credentials. These tests act as executable specifications that validate authentication requirements and ensure code correctness.

Tests as primary specification may not suit exploratory prototypes where requirements fluctuate rapidly and writing durable tests first creates overhead. This methodology works best when implementing features requiring clear, maintainable behavior documentation.

Applying TDD discipline reduces divergence between code and documentation by making tests the executable specification for requirements. This methodology ensures documentation stays synchronized with implementation because tests fail when behavior changes.