def test_fsm_state_exit():
a = 0
def stop():
nonlocal a
a = a - 1
state_machine = Fsm('playing')
state_machine.append_state(name='playing', on_exit=stop)
state_machine.append_transition(src='playing', event='off', dst='idle')
state_machine.event('off')
assert state_machine.state == 'idle'
assert a == -1
def test_fsm_state_enter():
a = 0
def start():
nonlocal a
a = a + 1
state_machine = Fsm('idle')
state_machine.append_state(name='playing', on_enter=start)
state_machine.append_transition(src='idle', event='on', dst='playing')
state_machine.event('on')
assert state_machine.state == 'playing'
assert a == 1