add TestParsePeriod
add TestParsePeriod

MrStrong/Sia,NebulousLabs/Sia,mharkus/Sia,mtlynch/Sia,ChrisSchinnerl/Sia,MrStrong/Sia,NebulousLabs/Sia,mharkus/Sia,mtlynch/Sia,ericflo/Sia,ericflo/Sia,ChrisSchinnerl/Sia