A Few Practical Notes on TDD

Points Worth Knowing

• TDD indirectly forces your code to be testable by design from the start, rather than retrofitting tests later.
• One side effect of TDD is living documentation that always stays in sync with the code's actual behavior.
• TDD is especially valuable when refactoring old code, since every change is instantly verified by running the tests.

Takeaway

None of these points are complicated on their own, but knowing them can lead to better technical decisions about TDD on your next project.