I don't really see how? If you changed that functionality intentionally, then the other things it interacts with will require a change regardless. Furthermore,

I don't really see how? If you changed that functionality intentionally, then the other things it interacts with will require a change regardless. Furthermore, if it's that small of a change(as usually, the smallest changes are the ones that impact the most tests), it usually doesn't require any change to the test, aside from adding/subtracting a parameter or something. Major functionality changes should carry weight. It's like saying that a motorcycle runs so much faster without a person on it- it defeats the purpose.