set flag RegionBorder_innerPoints_debug. svoid test_RegionBorder_innerPoints_withDiagonals_thinSpike() { BWImage img = bwImageFromString([[ ______ _xxxx_ _xx___ ______ ]]); FastRegions_BWImage regions = new(img); regions.run(); assertEqualsVerbose(2, regions.nRegions()); RegionBorder_innerPoints_withDiagonals border = new(regions.getRegion(2)); var points = border.allPoints(); //removeLastIfSameAsFirst(points); assertEqualsVerbose("4448782", str(border.onePath())); }