Running tests in parallel mono environment inside of MonoDevelop

I have a parallel mono environment installed to run my app and unit tests. The app relies on MONO_PATH to find some of the assemblies it depends on.

Now when I run my unit tests in Monodevelop they don't work because MONO_PATH gets cleared before running the tests. Setting environment variables in the project options doesn't help because they don't get set when running tests.

Any ideas how the tests could be made to work within MD? Are there any extension points that I could plug in to?

(MD 5.9.8 with Mono 3.12.1; my app requires Mono 3.4)