test-driven-development

Test-driven development is a workflow where you write failing tests before implementation to establish expected behavior. It uses a red-green-refactor cycle to ensure code correctness and prove that features behave as intended before release.

To fix bugs using the Prove-It pattern in unit testing, you first write a test that reproduces the bug, confirming the failure. You then implement the minimal code fix to make the test pass, ensuring the specific behavior is proven correct.

To start applying red-green-refactor, run your test suite to see failing tests, write the minimal implementation code to pass those tests, and then refactor the code while keeping the tests green to maintain quality.

Yes, test-driven development works for refactoring existing code by enforcing a red-green-refactor workflow. You write tests to prove current behavior before making changes, ensuring the refactored code maintains correctness and reliability.

You should use test-driven development when building new features, fixing bugs, or refactoring to prove behavior before changes are released. It guarantees code correctness by establishing automated checks upfront rather than relying on post-implementation testing.