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