使用存根时为什么会出现ExpectationViolationException？

Question

此测试使用NUnit 2.5和Rhino.Mocks 3.5：

[TestFixture]
public class ExcelWorksheetColumnTests
{
        private const string _name = "F1";
        private const int _index = 0;

        private MockRepository _repo;


        [SetUp]
        public void SetUp(){_repo = new MockRepository();}


        private ExcelWorksheetColumn CreateColumnUsingFixtureFieldsButWith(IExcelWorksheet excelWorksheet)
        {
            return new ExcelWorksheetColumn(_name, _index, excelWorksheet);
        }

        [Test]
        public void When_SelectedShootColumnType_Is_Changed_Raises_SelectedShootColumnTypeChanged_Event()
        {
            var stubWorksheet = _repo.Stub<IExcelWorksheet>();

            ExcelWorksheetColumn column =
                CreateColumnUsingFixtureFieldsButWith(stubWorksheet);

            stubWorksheet
               .Stub(p => p.GetSelectedShootColumnType(column))
               .Return(ShootColumnType.Generic);

            _repo.ReplayAll();

            bool itHappened = false;

            column.SelectedShootColumnTypeChanged 
                += (s, e) => { itHappened = true; };

            column.SelectedShootColumnType = ShootColumnType.SubjectId;

            Assert.That(itHappened);
        }

        [TearDown]
        public void TearDown()
        {
            _repo.ReplayAll();
            _repo.VerifyAll();
        }
}

收到此消息失败：

  

Rhino.Mocks.Exceptions.ExpectationViolationException：      IExcelWorksheet.SetSelectedShootColumnType（      ClassPhotolink.Model.CreateSubjectList.ExcelWorksheetColumn，SubjectId）;

     

预期＃0，实际＃1。

我认为Stubs用于返回值或忽略方法调用。为什么要尝试验证对

的调用

IExcelWorksheet.SetSelectedShootColumnType(
    IExcelWorksheetColumn column, 
    ShootColumnType type)

在犀牛模拟wiki中，它表示关于Stub扩展方法“请记住，默认情况下 Rhino Mocks将忽略意外的方法调用。”

---

测试编辑。

删除SetUp＆amp; TearDown代码，这仍然失败：

    [Test]
    public void When_SelectedShootColumnType_Is_Changed_Raises_SelectedShootColumnTypeChanged_Event()
    {
        var repo = new MockRepository();
        var stubWorksheet = repo.Stub<IExcelWorksheet>();

        ExcelWorksheetColumn column = CreateColumnUsingFixtureFieldsButWith(stubWorksheet);

        stubWorksheet
            .Stub(p => p.GetSelectedShootColumnType(column))
            .Return(ShootColumnType.Generic);

        repo.ReplayAll();

        bool itHappened = false;

        column.SelectedShootColumnTypeChanged += (s, e) => { itHappened = true; };

        column.SelectedShootColumnType = ShootColumnType.SubjectId;

        Assert.That(itHappened);
    }

但这正如我所希望的那样。

    [Test]
    public void When_SelectedShootColumnType_Is_Changed_Raises_SelectedShootColumnTypeChanged_Event()
    {
        var stubWorksheet = MockRepository.GenerateStub<IExcelWorksheet>();

        ExcelWorksheetColumn column = CreateColumnUsingFixtureFieldsButWith(stubWorksheet);

        stubWorksheet
            .Stub(p => p.GetSelectedShootColumnType(column))
            .Return(ShootColumnType.Generic);

        bool itHappened = false;

        column.SelectedShootColumnTypeChanged += (s, e) => { itHappened = true; };

        column.SelectedShootColumnType = ShootColumnType.SubjectId;

        Assert.That(itHappened);
    }

所以它似乎与repo.Stub（）和MockRepository.GenerateStub（）;

有关。

Answer 1

使用Stub()表示您执行期望进行方法调用。 意外调用是对未设置期望的方法的调用。

更新

我现在想知道问题是你使用的是设置，拆卸和记录/重放，这是不必要的。

如果以这种方式编写测试会发生什么：

[TestFixture]
public class ExcelWorksheetColumnTests
{
        private const string _name = "F1";
        private const int _index = 0;

        private ExcelWorksheetColumn CreateColumnUsingFixtureFieldsButWith(IExcelWorksheet excelWorksheet)
        {
            return new ExcelWorksheetColumn(_name, _index, excelWorksheet);
        }

        [Test]
        public void When_SelectedShootColumnType_Is_Changed_Raises_SelectedShootColumnTypeChanged_Event()
        {
            var stubWorksheet = MockRepository.Stub<IExcelWorksheet>();

            ExcelWorksheetColumn column =
                CreateColumnUsingFixtureFieldsButWith(stubWorksheet);

            stubWorksheet
               .Stub(p => p.GetSelectedShootColumnType(column))
               .Return(ShootColumnType.Generic);

            bool itHappened = false;

            column.SelectedShootColumnTypeChanged 
                += (s, e) => { itHappened = true; };

            column.SelectedShootColumnType = ShootColumnType.SubjectId;

            Assert.That(itHappened);
        }
}