svoid test_RegionBorder_innerPoints_v2_onePathWithOrigin() {
  BWImage img = bwImageFromString([[
    ______
    _xxx__
    _x_x__
    _xxx__
    ______
  ]]);
  FastRegions_BWImage regions = new(img);
  regions.run();
  RegionBorder_innerPoints_v2 border = new(regions.getRegion(2));
  OnePathWithOrigin path = border.onePathWithOrigin();
  print(path);
  assertEqualsVerbose(pt(1, 1), path.origin());
  assertEqualsVerbose("44668822", path.pathString());
}

Began life as a copy of #1034904