roslyn: Expression compiler unit tests fail when run locally

Running msbuild /v:m /m BuildAndTest.proj locally fails with errors in the VB and C# expression compiler unit tests:

xUnit.net Console Runner (32-bit .NET 4.0.30319.42000)
System.IO.FileLoadException: Could not load file or assembly 'Microsoft.VisualStudio.Debugger.Engine, Version=1.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' or one of its dependencies. Strong name validation failed. (Exception from HRESULT: 0x8013141A)
System.Security.SecurityException: Strong name validation failed. (Exception from HRESULT: 0x8013141A)