I'm trying to test a fork of SheepShaver with the old CPU core, & am having trouble getting the tests to work because they're written for the QEMU core. Does anyone know of a more universal tester for a PowerPC emulator? For anyone who wants for to see it, the source of my fork is at https://github.com/JustinCB/macemu.

I do know of this independent set of tests, at least. (You may download DevkitPPC from here.) You may also try risu.

Also, Sheepshaver does have a regression test file buried deep inside, but it's not really a unit test per say.

The dolphin tests look promising, and I know about the sheepshaver regression test. The sheepshaver test is tangled up with cruft like everything else relating to sheepshaver, though. I think the dolphin tests would be easier to use(relatively). I think just using a PowerPC compiler that compiles OS code would work if I add trap instructions into "test mode"