All tests run from test runner fail due to assembly resolve error.

[General-Fault]

The test fails with the output: "The active Test Run was aborted because the execution process exited unexpectedly. To investigate further, enable local crash dumps either at the machine level or for process te.processhost.managed.exe. Go to more details: http://go.microsoft.com/fwlink/?linkid=232477"

The fusion logs show errors loading the test assembly, but all attempts are from the test runner directory and the GAC. It should be looking for the assembly in the test project output directory.

[General-Fault]

Found this on NUnits Issue list: "NUnit agent cannot resolve test dependency assemblies when mixed mode initialization runs in the default AppDomain"
nunit/nunit#681

Also see: http://stackoverflow.com/questions/17993010/dlls-loaded-from-wrong-appplicationbase-when-trying-to-load-mixed-c-sharp-and-c/18499944#18499944

Looks like there is a fix in the works. In the mean time, try using the console runner or GUI runners with DomainUsage="Single" set.

[General-Fault]

Running the tests in a console runner with the option -domain=None works.