test-driven-development

Test-driven development prevents bugs by enforcing a strict red-green-refactor cycle, requiring you to write failing tests before any production code. This methodology ensures code reliability by guiding you to write minimal code to pass predefined tests, followed by refactoring.

The red-green-refactor cycle in software testing is a core TDD methodology where you write a failing test, implement minimal code to make it pass, and then refactor. This iterative process ensures code quality and prevents regressions by validating behavior at each step.

To start writing a failing test before production code, describe the desired behavior of a new function, such as 'calculateTotal', in a test file. Run the test to confirm it fails, then write the simplest code possible to make that test pass, ensuring the feature works as intended.

Common testing anti-patterns that undermine code quality include rationalizations for skipping tests and writing tests after production code. Addressing these pitfalls ensures effective testing by enforcing strict adherence to the TDD methodology and preventing regressions through proper test coverage.

You should use test-driven development for refactoring when you need to ensure code quality and prevent regressions. By enforcing the red-green-refactor cycle, TDD allows you to safely improve code structure while maintaining confidence that existing behavior remains intact and validated.

Yes, test-driven development can work without external dependencies by focusing on the core red-green-refactor methodology and writing tests that describe desired behavior. The approach relies on strict adherence to writing failing tests first rather than specific testing frameworks or libraries.