tests: multiple decorators
tests: multiple decorators

The previous commit fixed the issue with using multiple decorators on
the same function. Test cases were added to test if `register_operation`
wraps a function decorated by `protectron`.

Signed-off-by: Gergő Nagy <d3dcad219f7887bf0aa35b3eb99ea75d409b64fe@gmail.com>

ngergo/ratatoskr,hkrist/ratatoskr