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Mocking concrete object calls original code

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answered on 25 Jul 2010, 03:38 AM

I have the same issue. The latest release avaiable is "JustMock Trial Version: 2010.2 713 (Jul 13, 2010)".

Have you build a new version that correct this bug? When can I download it?

Here is my concrete class:

   Public Class FileManager
      Implements IFileManager

      Public Function Delete(ByVal path As String) As Boolean Implements IFileManager.Delete
         System.IO.File.Delete(path)

         Return True
      End Function

      Public Sub Create(ByVal path As String) Implements IFileManager.Create
         System.IO.File.Create(path)
      End Sub
   End Class

And here is my test:

      <Test()> _
      Public Sub TestDelete()
         Dim fileManager As JustMockFile.FileManager

         fileManager = Mock.Create(Of JustMockFile.FileManager)()

         Mock.SetupStatic(Of System.IO.File)(Behavior.Strict)
         Mock.Arrange(Sub() System.IO.File.Delete(Arg.AnyString))
         Mock.Arrange(Function() fileManager.Delete(Arg.AnyString)).Returns(False)

         Assert.IsFalse(fileManager.Delete(Arg.AnyString))
      End Sub

The problem is that instead of just calling a "fake" that return "false", that is trying to call "System.IO.File.Delete" that is define in the FileManager.

The reason why I will pay 400$ for a Mocking framework instead of just use Moq is because theses great features. I'm sorry for that but my boss asks me to hurry to know which framework we will use and I try a lot of things with static methods and concrete class since a couples of days and it's not working.

Please, give me an answer as fast as possible.

Thank you

answered on 26 Jul 2010, 09:09 AM

Hi Samuel,

File is a framework [mscrolib] class and it can't be mocked as like other static methods. You don’t need to do Mock.SetupStatic(Of System.IO.File)(Behavior.Strict) for File. Therefore, you can directly jump into to the arrrange part [paritial mocking of members]. Also, you need to provide a MockClass attribute on top of your test class.

Finally, you can take a look at the MsCorlibFixture in the Elevated tests in C# examples. You will find examples of mocking File.

Addtionally, there was an issue with static methods for non framework methods. If you need a build urgently, I can personally send you one. All you have to do is to send a drop location in the previously mentioned email in this thread.

Hope that helps,
Mehfuz

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answered on 26 Jul 2010, 09:24 AM

Hi Samuel,
Additionally you could open JustMock examples (usually located in \Program Files (x86)\Telerik\JustMock\Example) and open the MsCorlibFixture.cs file.
There you'll find several tests mocking File operations.
e.g.

[TestMethod]
public void ShouldMockStaticFileOperation()
{
    Mock.Arrange(() => File.Delete(Arg.IsAny<string>())).DoNothing();
    //does nothing
    File.Delete("dummy");
}

You just need to make sure that you've marked the test class with the [MockClass] attribute.

Hope this helps.

Regards,
Chris
the Telerik team

answered on 27 Jul 2010, 04:10 PM

I hate to jump onto a question but I'm having the same issue. I was trying to Mock an Entity Framework object simply by calling:

var context = Mock.Create<DataEntity>(Behavior.Strict);

Mock.Arrange(() => context.History).ReturnsCollection(GetFakeHistory());



But executing the tests throws an exception because the context is trying to connect to the database.  Now I suspect that the issue has more to do with the Entity Framework, if so I'll just tweak the T4 template.  But I thought I'd throw this up here just in case, especially do to the version issue I ran into.  The version on the site says 2010.2.713.17 but the version downloaded is actually 2010.1.713.17 dunno if that's just me, or what.