如何检查黄瓜没有变化？

Given I am on the data entry screen
And I have selected \"do not update frobnicator\"
When I submit the form
Then the frobnicator is not updated

private DataEntryScreen _testee;

[Given(@\"I am on the data entry screen\")] 
public void SetUpDataEntryScreen()
{
    var dataService = new Mock<IDataAccessLayer>();
    var frobby = new Mock<IFrobnicator>();

    dataService.Setup(x => x.SaveRecord(It.IsAny<IFrobnicator>())).Verifiable(); 
    ScenarioContext.Current.Set(dataService, \"mockDataService\");

    _testee = new DataEntryScreen(dataService.Object, frobby.Object);
}

[Given(@\"I have selected \"\"do not update frobnicator\"\"\")]
public void FrobnicatorUpdateIsSwitchedOff()
{
    _testee.Settings.FrobnicatorUpdate = false;
}

[When(@\"I submit the form\")]
public void Submit()
{
    _testee.Submit();
}

[Then(@\"the frobnicator is not updated\")]
public void CheckFrobnicatorUpdates()
{
    var dataService = ScenarioContext.Current.Get<Mock<IDataAccessLayer>>(\"mockDataService\");

    dataService.Verify(x => x.SaveRecord(It.IsAny<IFrobnicator>()), Times.Never);
}

Given I am on the data entry screen
And the blah is set to \"foo\"
When I set the blah to \"bar\"
And I select \"do not update frobnicator\"
And I submit the form
Then the blah should be \"foo\"