added test coverage for oxlified function
added test coverage for oxlified function

ged-lab/khmer,F1000Research/khmer,F1000Research/khmer,F1000Research/khmer,Winterflower/khmer,Winterflower/khmer,Winterflower/khmer,souravsingh/khmer,souravsingh/khmer,souravsingh/khmer,ged-lab/khmer,ged-lab/khmer