tdd-workflow

The RED-GREEN-REFACTOR cycle in test-driven development is a methodology where you write a failing test (RED), implement minimal code to pass it (GREEN), and then refactor the code for better quality while keeping tests green.

To structure tests using the AAA pattern in TDD, you organize your test code into three distinct sections: Arrange the necessary preconditions and inputs, Act on the behavior being tested, and Assert the expected outcomes against the actual results.

The Three Laws of TDD are principles that enforce writing tests before implementation, ensuring every piece of software development has test coverage. They guide developers to write no production code without a failing test, maintaining continuous verification and code quality.

You should apply refactoring techniques in the TDD workflow during the REFACTOR phase, which occurs only after your tests pass in the GREEN phase. This ensures you can safely improve code quality and structure without changing its external behavior or breaking functionality.

Yes, test-driven development works for refactoring existing software features by first writing tests that capture the current behavior, verifying they pass, and then using the RED-GREEN-REFACTOR cycle to safely improve the underlying code structure.

The best way to write minimal code implementation during TDD is to write only enough production code to make the failing test pass in the GREEN phase, deliberately avoiding premature optimization or extra features until the next test requires them.