Using zaptest and observer

[3vilhamster]

Hey folks.
I use zap and for test usually I use zaptest to ensure that I'll see logs only from failed tests in output.
But now I need to verify that some logs were written, in this case zap provides a zaptest/observer package. The problem for me is that observer could be used only with zap.New(core) which still writes stdout/stderr together with observer.
I'd like to know if there is a solution that allows me use both zaptest and zaptest/observer together?
Or maybe request a feature/help with PR to do that.