Updated face_at_link test.
Updated face_at_link test.

landlab/landlab,RondaStrauch/landlab,cmshobe/landlab,ManuSchmi88/landlab,RondaStrauch/landlab,ManuSchmi88/landlab,laijingtao/landlab,csherwood-usgs/landlab,Carralex/landlab,amandersillinois/landlab,landlab/landlab,RondaStrauch/landlab,landlab/landlab,SiccarPoint/landlab,cmshobe/landlab,ManuSchmi88/landlab,Carralex/landlab,csherwood-usgs/landlab,cmshobe/landlab,Carralex/landlab,laijingtao/landlab,amandersillinois/landlab,SiccarPoint/landlab