add test for buried bad block
add test for buried bad block

mharkus/Sia,rivine/rivine,MrStrong/Sia,mharkus/Sia,rivine/rivine,ericflo/Sia,Mingling94/Sia,mnsl/Sia,kustomzone/Sia,NebulousLabs/Sia,ericflo/Sia,MrStrong/Sia,johnathanhowell/Sia,mnsl/Sia,mtlynch/Sia,mtlynch/Sia,NebulousLabs/Sia,ChrisSchinnerl/Sia,ChrisSchinnerl/Sia