Add tests for first-rindex
Add tests for first-rindex

laben/roast,niner/roast,dankogai/roast,b2gills/roast,bitrauser/roast,dankogai/roast,perl6/roast,cygx/roast,b2gills/roast,dankogai/roast,cygx/roast,zostay/roast,niner/roast,skids/roast,niner/roast,skids/roast,laben/roast,cygx/roast,skids/roast,b2gills/roast,zostay/roast,dogbert17/roast,bitrauser/roast,zostay/roast,laben/roast,dogbert17/roast