FakeItEasy class 包含假方法不被識別為假 object 問題

Question

我有這段代碼：

[Fact]
public async Task AnnouncerIndex_Test_1()
{
    //Arrange

    var fakeContext = A.Fake<OrganizerDbContext>();
    var fakeUserManager = A.Fake< UserManager<AppUser>>();
    var controller = new AnnouncementsController(fakeContext, fakeUserManager);
    

    A.CallTo(() => controller
                    .IsUserBlockedFromAccesingAnnouncer("aaa"))
                    .Returns(Task.FromResult(false));

    
    //Act
    //some code
     
    //Assert
    //some code

}

我想對我的 controller 中的方法運行單元測試，我正在測試的方法調用另一個方法，我想用使用 A.CallTo(()=>) 的預定義方法替換它返回的值。 但是相反，我被告知經過測試的 controller 不是假的 object，在運行測試后我得到了這個摘要：

System.ArgumentException : Object 'Organizer3.Controllers.AnnouncementsController' of type Organizer3.Controllers.AnnouncementsController is not recognized as a fake object.

  Stack Trace: 
DefaultFakeManagerAccessor.GetFakeManager(Object proxy) line 28
Fake.GetFakeManager(Object fakedObject) line 28
FakeConfigurationManager.GuardAgainstNonFake(Object target) line 83
FakeConfigurationManager.CallTo[T](Expression`1 callSpecification) line 45
A.CallTo[T](Expression`1 callSpecification) line 161
AnnouncementsControllerTests.AnnouncerIndex_Test_1() line 32
--- End of stack trace from previous location ---

我還嘗試創建假的 controller，但這樣做並不允許我測試其中的方法。

var fakeController =A.Fake<AnnouncementsController>();           
A.CallTo(() => fakeController
                .IsUserBlockedFromAccesingAnnouncer("aaa"))
                .Returns(Task.FromResult(false));

測試總結：

FakeItEasy.Configuration.FakeConfigurationException : 

  The current proxy generator can not intercept the method Organizer3.Controllers.AnnouncementsController.IsUserBlockedFromAccesingAnnouncer(System.String CUID) for the following reason:
    - Non-virtual members can not be intercepted. Only interface members and virtual, overriding, and abstract members can be intercepted.



  Stack Trace: 
DefaultInterceptionAsserter.AssertThatMethodCanBeInterceptedOnInstance(MethodInfo method, Object callTarget) line 23
FakeConfigurationManager.AssertThatMemberCanBeIntercepted(ParsedCallExpression parsed) line 96
FakeConfigurationManager.CallTo[T](Expression`1 callSpecification) line 46
A.CallTo[T](Expression`1 callSpecification) line 161
AnnouncementsControllerTests.AnnouncerIndex_Test_1() line 36
--- End of stack trace from previous location ---

Answer 1

您的第一次嘗試沒有成功，因為如錯誤消息所述，您的new AnnouncementsController不是假的，它是 class 的實際實例，因此 FakeItEasy 無法對其進行配置。

第二次嘗試（使用偽造的AnnouncementsController ）可能會奏效，但您需要更改IsUserBlockedFromAccesingAnnouncer以使其成為虛擬的，以便 FakeItEasy 可以偽造它。 此外，您還需要將偽造的依賴項傳遞給它，如下所示：

var fakeController = A.Fake<AnnouncementsController>(options =>
    options.WithArgumentsForConstructor(() => new AnnouncementsController(fakeContext, fakeUserManager)));