You know, one thing that I forgot to mention, but it's vitally important to remember: if you find out you didn't test something, you might want to ask yourself if you have dead code. In your example, do you ever call that code in scalar context? (well, void context would also exercise that condition, but we'll ignore that) If not, you have dead code. If you do call it in scalar context, why are you overloading the return value? If you don't need to, perhaps this is an opportunity to simplify your code and thereby reduce the chances of bugs.
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