Fixed unit tests for new link ordering.
Fixed unit tests for new link ordering.

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