Removed unit tests for non-existant functions.
Removed unit tests for non-existant functions.

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