Unit testing "hybrid" WPF/Silverlight controls

I'm starting a new WPF/Silverlight custom control project and wanted to do unit testing on this one. However I'm a little confused about how to approach this.

This control would be based on the same codebase for both WPF and Silverlight with minor forking using #ifs and partial classes to tame the differences. I guess I could write unit tests for WPF part with NUnit, MSTest, xUnit, etc. and for the Silverlight part with Silverlight Unit Test Framework but this doesn't sound very elegant to me. I'd have to either ignore testing identical code on one of the platforms and test only differing parts (which is not very trustworthy) or rewrite tests for 2 fr开发者_如何学JAVAameworks (which is annoying). Is this the right way to go?

I'm wondering if there's some guidance, articles, tutorials out there on how to approach this task. Any pointers?

I am hardly an expert in WPF and Silverlight, but wouldn't it be possible to write the tests using the same techniques as the production code (#ifs and partial classes as you said)?

I tried to use xUnit first but it was kind of complicated to make same tests work in xUnit and SLUT (different attributes, syntax, etc.)

Then I did some basic experimenting with MSTest and from very simple test it looks like you can successfully use MSTest for the WPF part and same code with some #ifs, etc. and SLUT for the Silverlight part. So I'll try to go this route and see how it works in real-world situations.