Fix test so that it's not trying to use is_approx on NaN values.
Fix test so that it's not trying to use is_approx on NaN values.

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