svoid test_BresenhamLineDrawer() {
  assertEqualsVerbose(llPts(1, 1, 2, 1, 3, 1, 4, 2, 5, 2, 6, 2),
    asList(enableScaffolding(new BresenhamLineDrawer(1, 1, 6, 2)));
  assertEqualsVerbose(llPts(1, 3, 2, 3, 3, 3, 4, 2, 5, 2, 6, 2),
    asList(enableScaffolding(new BresenhamLineDrawer(1, 3, 6, 2));
  assertEqualsVerbose(llPts(10, 10, 10, 9),
    asList(enableScaffolding(new BresenhamLineDrawer(10, 10, 10, 9));
}