tdd-workflow

Test-Driven Development improves maintainability by ensuring functionality is verified from the outset. You write tests before implementation, which guarantees your code is testable and fulfills specific, pre-defined requirements.

To start writing tests before code, begin the TDD cycle by writing a failing test for your new feature. Then write the minimal implementation code to pass that test, and finally refactor the code while keeping the test green.

You should use mocks and stubs in unit testing when you need to isolate the code being tested from its external dependencies. Proper use of test doubles ensures your tests remain focused on specific functionality rather than integrated systems.

Best practices for structuring unit tests include using a single assertion per test, writing descriptive test names, and following the Arrange-Act-Assert structure. These practices ensure tests are maintainable and clearly communicate their purpose.

Yes, Test-Driven Development works for refactoring existing code by ensuring tests remain green during the process. The methodology guarantees that functionality stays verified and testable while you improve the internal structure of the code.