Add testcase to Acronym test for single letter word
Add testcase to Acronym test for single letter word

jmluy/xjava,exercism/xjava,FridaTveit/xjava,FridaTveit/xjava,nickRm/xjava,jmluy/xjava,exercism/xjava,jtigger/xjava,nickRm/xjava,jtigger/xjava