public List<TestOutcome> aggregateTestOutcomesByTestMethods() {
    List<TestOutcome> allOutcomes = getTestOutcomesForAllParameterSets();

    if (allOutcomes.isEmpty()) {
      return Lists.newArrayList();
    } else {
      return aggregatedScenarioOutcomes(allOutcomes);
    }
  }
  private void recordTestOutcomeAsSteps(TestOutcome testOutcome, TestOutcome scenarioOutcome) {
    final String name = alternativeMethodName(testOutcome);
    TestStep nestedStep = TestStep.forStepCalled(name).withResult(testOutcome.getResult());
    List<TestStep> testSteps = testOutcome.getTestSteps();

    if (testOutcome.getTestFailureCause() != null) {
      nestedStep.failedWith(testOutcome.getTestFailureCause().toException());
    }

    if (!testSteps.isEmpty()) {
      for (TestStep nextStep : testSteps) {
        nextStep.setDescription(
            normalizeTestStepDescription(
                nextStep.getDescription(), scenarioOutcome.getTestSteps().size() + 1));
        nestedStep.addChildStep(nextStep);
        nestedStep.setDuration(nextStep.getDuration() + nestedStep.getDuration());
      }
    }

    if (nestedStep.getDuration() == 0) {
      nestedStep.setDuration(testOutcome.getDuration());
    }
    scenarioOutcome.recordStep(nestedStep);
  }