The other test print I do if I want to really push a machine is a print in place fidget cube :-)
https://www.thingiverse.com/thing:1752508

With my monoprice mini delta, I put a 0.25mm nozzle on and made one of these really tiny - 10mm on a side when in the 'cube' configuration.

I will admit to adjusting the internal gaps between surfaces a little bit. 0.1mm works well.

The thing is a benchy has no moving parts - so is not a good PRACTICAL test of a printer.
An iris box and print-in-place fidget cube on the other hand, will only work with a printer that has every aspect, dialled in properly :-) Including the filament. A filament that won't retract without leaving blobs - won't work with either print.
And when they work they are useful to have and good to give away :-)

If you can print a working version of either - you can print ANYTHING !