static TestResults testTrainableFunction(O function, L inputParams, L outputParams) {
  new TestResults results;
  O trained = callF(function, inputParams);
  for (int i = 0; i+1 < l(outputParams); i += 2)
    try {
      O out = callF(trained, params[i]);
      results.add(testResult_eq(out, params[i+1]));
    } catch e {
      results.add(testResult_error(e));
    }
  ret results;
}