add test case for public methods on trivial grammar
add test case for public methods on trivial grammar

jeffreykegler/kollos,jeffreykegler/libmarpa,pczarn/kollos,pczarn/kollos,jeffreykegler/kollos,jeffreykegler/libmarpa,pczarn/kollos,jeffreykegler/libmarpa,jeffreykegler/kollos,jeffreykegler/kollos,pczarn/kollos,jeffreykegler/libmarpa,jeffreykegler/libmarpa,jeffreykegler/kollos,pczarn/kollos