If you use very low level tests then sure, maybe you need to adjust your tests to match the adjustments in the rest of your refactored code. But since by defini

If you use very low level tests then sure, maybe you need to adjust your tests to match the adjustments in the rest of your refactored code. But since by definition a refactoring does not change the code’s observable behaviour, no tests above that level should be affected. I find that very low level tests tend to be fragile and have limited value in most situations as a result, so I don’t personally tend to use them much, but YMMV.