`Hadrian test` insulates `runtests.py` from SIGINT
If you run hadrian test
and then press Ctrl-C to interrupt the testsuite runner the hadrian
process will terminate but the runtests.py
process will continue to run
If you run hadrian test
and then press Ctrl-C to interrupt the testsuite runner the hadrian
process will terminate but the runtests.py
process will continue to run