When Should I Use Unit Tests, and How Many?

Definitely consider testing those simple functions too! Even if your square root function seems straightforward, there could be side effects (like logging errors) that you may overlook later. Remember, unit tests can save you from unexpected changes that might introduce bugs.

When determining how many tests to write, think about the consequences of failure. If your function has any potential for substantial negative impact, more coverage will be beneficial. In my experience, aiming to test both 'happy paths' (expected results) and 'unhappy paths' (inputs that shouldn't work) is key.

I love this discussion! First off, remember that unit tests are here to help identify what breaks when changes happen. When multiple developers are involved, having unit tests helps ensure that everyone's contributions play nicely together without introducing bugs. For your project scope, it's valuable to have at least one test for every function, especially to check key functionalities and edge cases.

Lastly, don’t stress about 100% coverage. Instead, focus on critical paths and ensure you've tested scenarios relevant to your code's purpose. As projects grow and evolve, the context will guide you on where more tests are needed. Keep it practical!

Great question! Let's break it down. For something like the square root function, if it's just calling a standard library function, testing it might seem unnecessary. But if you have your own implementation (like using Newton's Method), then testing becomes essential. You want to ensure it handles various inputs correctly, including edge cases like negative numbers or zero.

The typical practice is to keep unit tests in the same repository as your code and run them every time you make a change to catch any future issues early. Ideally, aim to cover critical parts of your code – the goal here is to test all the public methods of your classes, as those are what other parts of the system will interact with. As for how many tests, it's often recommended to have at least one for every line of code, especially if it contains "if" statements or loops, to cover both the true and false branches.