💡Good tests are the immune system of your codebase.

Now - you wouldn't say you don't need your immune system - would you?!
#testing #TDD

If you write a unit test keeping these 4️⃣ attributes in mind. It will help you to write a good test:
⚡Speed
🔍Usefullness(It finds failures)
🔐Refactoring proof(Code can change without changing the test)
🧑🏻‍💻Maintainance cost
#TDD #testing