Probably you already know it: The new Windows Store App class libraries prevent proxy generating using frameworks like Castle.Core because System.Reflection.Emit namespace is missing in the limited framework they’re using.

But we still want to do TDD and therefore we need a nice mocking framework, like FakeItEasy, don’t we?

In this blog post I will show you the best way I came up with to develop Windows Store App compatible code with TDD.

So, how should you setup your project?

01 – Select target frameworks

1. Put all your productive code that will be TDD-ed into a PCL class library where you select whatever target frameworks you like to support
2. Create your test assembly as a regular class library
3. Add the references to FakeItEasy and your test framework(s) of choice (e.g. NUnit + FluentAssertions) to your *.Test assembly
4. Only put the UI stuff that you can’t test into a Windows Store App project

Your solution explorer should look similar to mine

02 – Solution Explorer

You’re ready to go. Happy TDDing with Windows Store Apps and FakeItEasy.

Yes, that is not the perfect solution. But at least it is a solution that works.

You’ll find FakeItEasy NuGet packages on NuGet and it’s sources on GitHub
The sample code can be found in my github account