svoid test_OneColorChecker() {
  //var img = shootScreen2();
  //var img = whiteImage(100, 100);
  var img = bwImageFromFunction(32, () -> random());
  //var img = new CheckerBoard;
  //img.cols = img.rows = 2;
  showImage(img);
  
  new OneColorTheoryChecker ot;
  var root = uRoot(img);
  var theory = ot.makeTheory(root);
  stepWithStats(64, ot.scheduler);
  print(theory.toStringWithEvidence());
}