svoid test_AutoClassifier1() {
  AutoClassifier1<S> c = new(S);
  assertEmpty(c.confidentlyPredictedLabelsForObject("hello"));
  c.learn("hello", "5 chars");
  c.learn("bla", "not 5 chars");
  assertEqualsIC("5 chars", joinWithComma(c.confidentlyPredictedLabelsForObject("world")));
  assertEqualsIC("not 5 chars", joinWithComma(c.confidentlyPredictedLabelsForObject("......")));
}