But why would you call something like that "negative testing"? Maybe I'm being too cynical, but my interpretation was that they wanted to know e.g. how many wo

But why would you call something like that "negative testing"? Maybe I'm being too cynical, but my interpretation was that they wanted to know e.g. how many would uninstall the app if it consumed more power. Would make business sense to test this, and would be logical to call it "negative testing": do something negative to the user and see if they react.