c# - 为什么 MSpec 中对 FakeItEasy 对象的 MustHaveHappened 调用失败？

Question

当运行以下测试时，所有断言都失败了。无法弄清楚为什么它们会失败，因为实际的实现确实有对对象的调用。

这是一个已知错误吗？因为其他一些测试确实成功了。

[Subject("Pst Cleanup")]
public class When_running_Pst_CleanUp
{
    Establish context = () =>
    {
        _folders = A.Fake<IOutlookFolderParameters>();
        _processor = A.Fake<IOutlookPstCleaner>();
    };

    Because of = () => _processor.Cleanup(_folders);

    It should_cleanup_the_mail_folder = () => A.CallTo(() => _folders.EmailFolder).MustHaveHappened();
    It should_cleanup_tasks_folder = () => A.CallTo(() => _folders.TaskFolder).MustHaveHappened();
    It should_cleanup_appointments_folder = () => A.CallTo(() => _folders.AppointmentFolder).MustHaveHappened();

    private static IOutlookPstCleaner _processor;
    private static IOutlookFolderParameters _folders;
}

Assertion failed for the following call: Outlook.Contracts.IOutlookFolderParameters.get_NotificationsFolder() Expected to find it at least once but no calls were made to the fake object.

at FakeItEasy.Core.FakeAsserter.AssertWasCalled(Func2　callPredicate,　String　callDescription,　Func2　repeatPredicate,　String　repeatDescription) at FakeItEasy.Configuration.RuleBuilder.MustHaveHappened(Repeated　repeatConstraint) at UnitTests.When_running_Pst_CleanUp.<.ctor>b__2() in When_running_Pst_CleanUp.cs: line 19

Answer 1

这是 FakeItEasy 绝对正确的行为。您需要使用 IOutlookPstCleaner 的实际实现才能使您的测试成功。始终确保你伪造了正确的东西，不要意外伪造你的 SUT。

通过测试刚被调用的属性，您绝对不会测试任何有值(value)的东西。我也可以只为 IOutlookPstCleaner 编写这个实现，这样您的测试就会成功:

public class Cleaner : IOutlookPstCleaner 
{
    public void Cleanup(IOutlookFolderParameters folders)
    {
        var email = folders.EmailFolder;
        var task = folders.TaskFolder;
        var appointment = folders.AppointmentFolder;
    }
}

如果您发布了IOutlookPstCleaner 的实现，我很乐意帮助您找到正确的测试对象。<​​/p>