ioreg/test: Add test for #140
ioreg/test: Add test for #140

Write-only registers shouldn't be read from.

Also remove parentheses from test names as this upsets the snake-case
lint.

richo/zinc,posborne/zinc,richo/zinc,farcaller/zinc,ryankurte/zinc,dirvine/zinc,phil-opp/zinc,tempbottle/zinc,tempbottle/zinc,hackndev/zinc,placrosse/zinc,farcaller/zinc,phil-opp/zinc,ryankurte/zinc,placrosse/zinc,placrosse/zinc,ryankurte/zinc,placrosse/zinc,dirvine/zinc,tempbottle/zinc,posborne/zinc,darayus/zinc,dirvine/zinc,richo/zinc,troplin/zinc,gapry/zinc,mcoffin/zinc,ryankurte/zinc,mcoffin/zinc,flxo/zinc,aethaniel/zinc,mcoffin/zinc,posborne/zinc,posborne/zinc,dirvine/zinc,hackndev/zinc,flxo/zinc,ryankurte/zinc,hackndev/zinc,hugwijst/zinc,phil-opp/zinc,hugwijst/zinc,darayus/zinc,aethaniel/zinc,placrosse/zinc,dirvine/zinc,ntwyman/zinc,phil-opp/zinc,ntwyman/zinc,farcaller/zinc,ntwyman/zinc,tempbottle/zinc,troplin/zinc,gapry/zinc,hackndev/zinc,troplin/zinc,tempbottle/zinc,farcaller/zinc,troplin/zinc,farcaller/zinc,posborne/zinc,0xc0170/zinc,ntwyman/zinc,richo/zinc,mcoffin/zinc,mcoffin/zinc,0xc0170/zinc,ntwyman/zinc,richo/zinc,phil-opp/zinc,troplin/zinc,hackndev/zinc