Properly Testing Home Button

Greetings,

I recently purchased a new digitizer with IC and Home button for iPad Mini.

I attached the digitizer cable (but didt fix both LCD and digitizer) and it looks like it works fine except the Home button, which clicks (I hold it by fingers), but no reaction.

My question is if it should work in such 'detached' state, i.e. is my digitizer Home button broken?

Please note the Mini lacks both LCD metal plate and logic board metal cover.

Thanks.