Is there any PCL-compatible BDD framework that can be used with Xamarin (and preferably xUnit.Net)

These days, I'm looking into Xamarin and Mobile Programming with .NET. More precisely, I'm currently trying to make my way through the testing story.

I'm well used to do TDD and also to write a lot of BDD-style tests in C#/.NET with various unit test frameworks. I find BDD tests especially useful when it comes to testing complex business logic that spans multiple components (e.g. database stuff).

I quickly found out that the best choice for unit testing against shared code that resides in a PCL is xUnit.Net. Now I'm in search for a BDD framework that complements this ensemble.

Does anybody know how this could be done, or knows about any other way to do BDD style testing in a PCL environment?