added new test to check for reported issue.
added new test to check for reported issue.

Shugyousha/go-porterstemmer,kiteco/go-porterstemmer,cuevasclemente/go-porterstemmer,sajari/go-porterstemmer,jmptrader/go-porterstemmer,blevesearch/go-porterstemmer,reiver/go-porterstemmer