$ python machine_spec.py
test_MachineShouldInitiallyHaveStateOfInitial (__main__.machine_spec) ... ok
test_MachineShouldRememberListOfValidStates (__main__.machine_spec) ... ok

----------------------------------------------------------------------
Ran 2 tests in 0.003s

OK
new-host:~/Development/dev/behaviour/example/machine/Listing11 aelfric$