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POInvalidCastException when passing a mocked dependency into a function
 

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    <p>I am using Rhino Mocks along with nUnit to attempt to test my function <code>IsApprovable()</code> on an object. The function I am testing relies on another object "UserManager" that needs to be passed in. I am attempting to mock an instance of UserManager so I can specify the result of another function <code>GetApproverDependantsList()</code></p> <p>My issue is that when I mock the object and pass it into the function I am testing I get the following InvalidCastException:</p> <p><strong>Unable to cast object of type 'Castle.Proxies.IUserManagerProxye15b431a53ca4190b7ffbdf5e241e2bb' to type 'MyNamespace.Users.UserManager'</strong>.</p> <p>I am new to this so I am not really sure if I am doing things correctly... Here is the sample mocking code I am using: </p> <pre><code>Dim helper As New BookingManagerHelper() Dim booking As Booking = GetDummyBooking() 'method to get a booking in suitable state Dim parameters As Collection(Of Parameter) = GetDummyParameters() 'factory method, as above Dim mockedUserManager = MockRepository.GenerateMock(Of Users.IUserManager)() 'I have created a dummy function called GetUserCollectionWithDependant() to create the results I need the mocked function to return... mockedUserManager.Stub(Function(x) x.GetApproverDependantsList(-1)).[Return](GetUserCollectionWithDependant(1)) 'It's the line below where I find my exception... Assert.AreEqual(True, helper.IsApprovable(booking, mockedUserManager, parameters)) </code></pre> <p>The function I am attempting to test looks like the following:</p> <pre><code>Public Function IsApprovable(ByVal Booking As Booking , ByVal UserManager As Users.UserManager, Optional ByVal Parameters As Collection(Of Parameter) = Nothing) As Boolean 'various logic checks are performed on the objects passed in End Function </code></pre> <p>Some things to note: </p> <ul> <li>UserManager implements the interface IUserManager</li> <li>UserManager contains additional properties and functions that are not defined by the interface</li> <li>UserManager also inherits from a base class (do I need to override base properties?)</li> </ul> <p>I can post more code if needed. Thanks in advance.</p>
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