add test for pipe()
add test for pipe()

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