@Override
  public void execute(ComputationStep.Context context) {
    PostMeasuresComputationCheck.Context extensionContext = new ContextImpl();
    for (PostMeasuresComputationCheck extension : extensions) {
      extension.onCheck(extensionContext);
    }
  }
@Test
  public void do_nothing_if_no_extensions() {
    // no failure
    newStep().execute(new TestComputationStepContext());
  }