test-driven-development

Test-driven development requires writing a failing test for new behavior before implementing any production code. This ensures tests drive the implementation and maintain proper coverage from the start.

To start writing unit tests before coding, write a test that fails for the desired new behavior. Implement only the minimum production code necessary to make that test pass, ensuring tests drive the feature implementation.

Yes, test-first workflows are useful for safe refactoring. By writing failing tests before modifying code, you ensure proper test coverage and maintain secure behavior during the refactor cycle.

The best way to ensure proper test coverage during bug fixes is to write a failing test that reproduces the bug first. Then, implement the minimum code correction required to turn the failing test green.

Yes, you must write a failing test before implementing production code. This test-first rule guarantees that the test actually validates the new behavior and that implementation is kept to the minimum necessary.

Test-driven development may not suit exploratory programming where requirements are highly volatile. The approach strictly enforces writing failing tests before production code, which requires knowing the expected behavior upfront.