Add some Nil related tests, as per S02:491
Add some Nil related tests, as per S02:491

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