public void should_return_the_later_model_propertie_and_try_to_update_the_common_properties()
 {
     _result.ShouldBeEqualTo(_newModelProperties);
     _result.AllCalculationMethods().ShouldContain(_c1);
     _result.AllCalculationMethods().ShouldContain(_c3);
 }
 public void should_return_the_former_model_propertie_without_changing_any_selected_calculation_method()
 {
     _result.ShouldBeEqualTo(_oldModelProperties);
     _result.AllCalculationMethods().ShouldContain(_c1);
 }