Mocking Assembly.ReflectionOnlyLoadFrom

[Nick]

I am trying to write a unit test for a class that internally calls the static function Assembly.ReflectionOnlyLoadFrom(string). I would like to Arrange that call to return a Mock Assembly. 

Is this even possible?

Below are my two approaches thus far, both ended with my arrangement being bypassed and the internal function being executed:

Mock.SetupStatic<Assembly>();
Mock.Arrange(() => Assembly.ReflectionOnlyLoadFrom(Arg.AnyString)).Returns(Mock.Create<Assembly>());

var test = Assembly.ReflectionOnlyLoadFrom("Some Assembly"); //this will throw an exception instead of returning the mock Assembly

Mock.Partial<Assembly>().For<string>((s) => Assembly.ReflectionOnlyLoadFrom(s));
Mock.Arrange(() => Assembly.ReflectionOnlyLoadFrom(Arg.AnyString)).Returns(Mock.Create<Assembly>());

var test = Assembly.ReflectionOnlyLoadFrom("Some Assembly"); //this will throw an exception instead of returning the mock Assembly

[Ricky]

Hi Nick,
Thanks again for making the post. Unfortunately, It will not be possible to mock Assembly.ReflectionOnlyLoad since it is already intercepted by the test system and as CLR profiler can not intercept a member that is already invoked.

However, Assembly is an abstract class and there are virtual methods and properties that you can easily mock using JustMock since virtual types can be mocked via proxy.


Hope this information is useful.

Kind regards,
Mehfuz
the Telerik team

[Allen]

Example please?

[Ricky]

Hi Allen,

Thanks again for bringing up the question. However to reproduce this locally , i would recommend you to take a look into this following post where without the initialization it fails to intercept the call that is already invoked. This happens to static / concrete method where it should be intercepted during OnJITCompilationStarted and can be done once.

http://www.telerik.com/community/forums/justmock/general-discussions/mocks-failing-to-work-correctly-in-large-test-runs.aspx

Here in the above example when Foo.StaticCall() will be invoked without the initialization the original test will fail since we can't use .net profiler to intercept it when it is already JIT compiled.

Similar thing is happening for the Assembly.ReflectionOnlyLoad where although i have arranged it. It never calls the interceptor thus fails (called by the .net profiler).

Hope that answers your question.

Kind regards,
Mehfuz
the Telerik team