Mechanism for catching link-time test stripping

So, I have an issue where a linker strips out all the test cases in separate files (but not the custom runner main).

I've tried to catch this at run time by adding [hidden] failing tests an asserting that a certain number fail, HOWEVER, this is both fragile and incompatible with *actually* running the main suite, as you can't have 2 session objects.

Any ideas?