def test_faildescr_numbering():
cpu = AbstractCPU()
fail_descr1 = AbstractFailDescr()
fail_descr2 = AbstractFailDescr()
n1 = cpu.get_fail_descr_number(fail_descr1)
n2 = cpu.get_fail_descr_number(fail_descr2)
assert n1 != n2
fail_descr = cpu.get_fail_descr_from_number(n1)
assert fail_descr is fail_descr1
fail_descr = cpu.get_fail_descr_from_number(n2)
assert fail_descr is fail_descr2
# provides interning on its own
n1_1 = cpu.get_fail_descr_number(fail_descr1)
assert n1_1 == n1
