Finishing on interrupt mode 0 ?

[fawtytoo]

Once the tests are finished, my emulator was not re-enabling interrupts, or so I thought. After much head scratching, I realised I wasn't handling IM 0 at all, but then the Spectrum doesn't use it anyway. If I handle IM 0 the same as IM 1, interrupts are working correctly again once the tests are finished. Is it possible your tests are finishing on IM 0 instead of IM 1? If so (or either way), which one of us is wrong?