[QuantitativeScale tests] Add test for rejecting negative padding values
[QuantitativeScale tests] Add test for rejecting negative padding values

palantir/plottable,softwords/plottable,palantir/plottable,palantir/plottable,NextTuesday/plottable,palantir/plottable,NextTuesday/plottable,softwords/plottable,NextTuesday/plottable,softwords/plottable