static TestResults testTrainableFunction(O function, L trainingParams, L testParams) {
  new TestResults results;
  O trained = callF(function, trainingParams);
  for (O key, O value : paramsToMap(testParams)) {
    try {
      O out = callF(trained, key);
      results.add(testResult_eq(out, value));
    } catch e {
      results.add(testResult_error(e));
    }
  }
  ret results;
}