When someone leaves have you ever had code dumped on you that you've never read before and has no tests? If you don't even know what the code is supposed to do,

When someone leaves have you ever had code dumped on you that you've never read before and has no tests? If you don't even know what the code is supposed to do, you can't write tests for it. The way I handled it is: when people come to me with a bug, then I fix it and add a test for it.