Mocking WinRT Types

2 posts, 0 answers
  1. Simon
    Simon avatar
    1 posts
    Member since:
    Nov 2012

    Posted 26 May 2014 Link to this post

    I'm currently evaluating JustMock for a Windows Store App that I'm developing.

    I've tried this code:

                var mock = Mock.Create<ConnectionProfile>(Constructor.NotMocked);

                Assert.AreEqual(NetworkConnectivityLevel.ConstrainedInternetAccess, mock.GetNetworkConnectivityLevel());

    And it fails with the following exception:

    Result Message: Test method JustMockWinRtTypes.UnitTest1.MockTest threw exception: 
    Telerik.JustMock.MockException: Failed to create instance of type 'Windows.Networking.Connectivity.ConnectionProfile'
    Result StackTrace:
    at Telerik.JustMock.Core.MocksRepository.CreateExternalMockMixin(Type mockObjectType, Object mockObject, IEnumerable`1 mixins, IEnumerable`1 supplementaryBehaviors, IEnumerable`1 fallbackBehaviors)
       at Telerik.JustMock.Core.MocksRepository.Create(Type type, MockCreationSettings settings)
       at Telerik.JustMock.MockBuilder.Create(MocksRepository repository, Type type, Object[] constructorArgs, Nullable`1 behavior, Type[] additionalMockedInterfaces, Nullable`1 mockConstructorCall, IEnumerable`1 additionalProxyTypeAttributes, List`1 supplementaryBehaviors, List`1 fallbackBehaviors, List`1 mixins, Expression`1 interceptorFilter)
       at Telerik.JustMock.Mock.<>c__DisplayClass81`1.<Create>b__80()
       at Telerik.JustMock.Core.ProfilerInterceptor.GuardInternal[T](Func`1 guardedAction)
       at Telerik.JustMock.Mock.Create[T](Constructor constructor)
       at JustMockWinRtTypes.UnitTest1.MockTest() in c:\Source Code\Spikes\JustMockWinRtTypes\JustMockWinRtTypes\UnitTest1.cs:line 22

    Can you tell me what I need to do to make this work?



  2. Kaloyan
    Kaloyan avatar
    871 posts

    Posted 29 May 2014 Link to this post

    Hi Simon,

    Thank you for reporting this.

    I managed to reproduce it on my side and further investigations lead to the fact that ConnectionProfile is actually a COM class. If you inspect it, you should notice that it comes from a .winmd file. Unfortunately, even as JustMock is fully integrated inside Win RT it still cannot mock COM types. So, this scenario is not supported by us, at this stage.

    Nevertheless, I will be happy to assist you with the evaluation further. I might be able to do so, if you share why do you need to mock exactly this class. Perhaps, me and my colleagues could think of a better approach that will work for your scenario.

    I hope this helps.


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