How to test a Windows Phone class library that uses System.ServiceModel - unit-testing

Question

I have a Windows Phone 8 class library. Within that class library I make use of System.ServiceModel. The class library runs fine when used from a Windows Phone 8 app.
I have a unit test project. If I try and use the unit test project to test methods in the class library I get a FileNotFoundExcaption:
{"Could not load file or assembly 'System.ServiceModel,
Version=2.0.5.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35'
or one of its dependencies. The system cannot find the file
specified.":"System.ServiceModel, Version=2.0.5.0, Culture=neutral,
PublicKeyToken=31bf3856ad364e35"}
I've tried using a binding re-direct, but because the two System.Service model assemblies have different publicKeyTokens that doesn't seem to work.
Is this possible?
The full fusion log is:
=== Pre-bind state information ===
LOG: User = MACHINENAME\Simon
LOG: DisplayName = System.ServiceModel, Version=2.0.5.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35
(Fully-specified)
LOG: Appbase = file:///c:/[...]/PhoneClassLibraryReferenceTest/PhoneClassLibraryTest/bin/Debug
LOG: Initial PrivatePath = NULL
Calling assembly : PhoneClassLibraryReferenceTest, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null.
===
LOG: This bind starts in default load context.
LOG: Using application configuration file: C:\PROGRAM FILES (X86)\MICROSOFT VISUAL STUDIO 11.0\COMMON7\IDE\COMMONEXTENSIONS\MICROSOFT\TESTWINDOW\vstest.executionengine.x86.exe.Config
LOG: Using host configuration file:
LOG: Using machine configuration file from C:\Windows\Microsoft.NET\Framework\v4.0.30319\config\machine.config.
LOG: Post-policy reference: System.ServiceModel, Version=2.0.5.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35
LOG: Attempting download of new URL file:///c:/[...]/PhoneClassLibraryReferenceTest/PhoneClassLibraryTest/bin/Debug/System.ServiceModel.DLL.
LOG: Attempting download of new URL file:///c:/[...]/PhoneClassLibraryReferenceTest/PhoneClassLibraryTest/bin/Debug/System.ServiceModel/System.ServiceModel.DLL.
LOG: Attempting download of new URL file:///c:/[...]/PhoneClassLibraryReferenceTest/PhoneClassLibraryTest/bin/Debug/System.ServiceModel.EXE.
LOG: Attempting download of new URL file:///c:/[...]/PhoneClassLibraryReferenceTest/PhoneClassLibraryTest/bin/Debug/System.ServiceModel/System.ServiceModel.EXE.

Answer 1

The solution to this is to install Visual Studio 2012 update 2, and use a Windows Phone 8 test project.
This way your tests are run via the emulator and target the correct versions of the System.ServiceModel assembly.
This blog post describes how to get going with Windows Phone 8 unit test projects.