def test_null_transition_constructor(self):
source_state = State("source")
event = Event("event")
transition = NullTransition(source_state, event)
assert transition.event == event
assert transition.source_state == source_state
assert transition.destination_state == source_state
def test_null_transition_with_valid_event(self):
state_machine = StateMachine("sm")
initial_state = State("initial_state")
event = Event("event")
state_machine.add_state(initial_state, initial_state=True)
state_machine.add_event(event)
assert state_machine.add_null_transition(initial_state,
event) is not None
def test_transition_with_invalid_event(self):
state_machine = StateMachine("sm")
initial_state = State("initial_state")
second_state = State("second_state")
event = Event("event")
state_machine.add_state(initial_state, initial_state=True)
state_machine.add_state(second_state)
assert state_machine.add_transition(initial_state, second_state,
event) is None
def test_self_transition_no_condition(self):
entry_callback = MagicMock()
exit_callback = MagicMock()
source_state = State("source")
source_state.on_exit(exit_callback)
source_state.on_entry(entry_callback)
event = Event("event")
transition = SelfTransition(source_state, event)
transition("data")
entry_callback.assert_called_once_with("data")
exit_callback.assert_called_once_with("data")
def test_null_transition_action(self):
source_state = State("source")
event = Event("event")
transition = NullTransition(source_state, event)
condition_callback = MagicMock(return_value=True)
action_callback = MagicMock()
transition.add_condition(condition_callback)
transition.add_action(action_callback)
transition("data")
condition_callback.assert_called_once_with("data")
action_callback.assert_called_once_with("data")
def test_null_transition_condition_false(self):
entry_callback = MagicMock()
exit_callback = MagicMock()
source_state = State("source")
source_state.on_exit(exit_callback)
source_state.on_entry(entry_callback)
event = Event("event")
transition = NullTransition(source_state, event)
condition_callback = MagicMock(return_value=False)
transition.add_condition(condition_callback)
transition("data")
entry_callback.assert_not_called()
exit_callback.assert_not_called()
condition_callback.assert_called_once_with("data")
def test_self_transition_condition_true(self):
entry_callback = MagicMock()
exit_callback = MagicMock()
source_state = State("source")
source_state.on_exit(exit_callback)
source_state.on_entry(entry_callback)
event = Event("event")
transition = SelfTransition(source_state, event)
condition_callback = MagicMock(return_value=True)
transition.add_condition(condition_callback)
transition("data")
entry_callback.assert_called_once_with("data")
exit_callback.assert_called_once_with("data")
condition_callback.assert_called_once_with("data")
def test_exit_callback(self):
exit_sm_cb = MagicMock()
state_machine = StateMachine("sm")
state_machine.on_exit(exit_sm_cb)
initial_state = State("initial_state")
second_state = State("second_state")
exit_state_error = ExitState("Error")
event = Event("event")
error_event = Event("error")
state_machine.add_state(initial_state, initial_state=True)
state_machine.add_state(second_state)
state_machine.add_state(exit_state_error)
state_machine.add_event(event)
state_machine.add_event(error_event)
state_machine.add_transition(initial_state, second_state, event)
state_machine.add_transition(second_state, exit_state_error,
error_event)
state_machine.start("data")
assert state_machine.current_state == initial_state
state_machine.trigger_event(event, "data")
assert state_machine.current_state == second_state
state_machine.trigger_event(error_event, "data")
assert state_machine.current_state == exit_state_error
exit_sm_cb.assert_called_once_with(exit_state_error, "data")
def create_child_fsm():
state_machine = StateMachine("child_sm")
exit_cb = MagicMock()
entry_cb = MagicMock()
initial_state = State("child_initial_state")
second_state = State("child_second_state")
initial_state.on_exit(exit_cb)
second_state.on_entry(entry_cb)
event = Event("event")
state_machine.add_state(initial_state, initial_state=True)
state_machine.add_state(second_state)
state_machine.add_event(event)
state_machine.add_transition(initial_state, second_state, event)
return state_machine
def test_event_trigger_no_initial_state(self):
state_machine = StateMachine("sm")
exit_cb = MagicMock()
entry_cb = MagicMock()
initial_state = State("initial_state")
second_state = State("second_state")
initial_state.on_exit(exit_cb)
second_state.on_entry(entry_cb)
event = Event("event")
state_machine.add_state(initial_state)
state_machine.add_state(second_state)
state_machine.add_event(event)
state_machine.add_transition(initial_state, second_state, event)
with pytest.raises(ValueError):
state_machine.trigger_event(event, "data")
def test_event_trigger(self):
state_machine = StateMachine("sm")
exit_cb = MagicMock()
entry_cb = MagicMock()
initial_state = State("initial_state")
second_state = State("second_state")
initial_state.on_exit(exit_cb)
second_state.on_entry(entry_cb)
event = Event("event")
state_machine.add_state(initial_state, initial_state=True)
state_machine.add_state(second_state)
state_machine.add_event(event)
state_machine.add_transition(initial_state, second_state, event)
state_machine.start("data")
exit_cb.assert_not_called()
entry_cb.assert_not_called()
state_machine.trigger_event(event, "data")
exit_cb.assert_called_once_with("data")
entry_cb.assert_called_once_with("data")
def test_event_trigger_propagate_but_no_child_sm(self):
state_machine = StateMachine("sm")
exit_cb = MagicMock()
entry_cb = MagicMock()
initial_state = State("initial_state")
second_state = State("second_state")
initial_state.on_exit(exit_cb)
second_state.on_entry(entry_cb)
event = Event("event")
state_machine.add_state(initial_state, initial_state=True)
state_machine.add_state(second_state)
state_machine.add_event(event)
state_machine.add_transition(initial_state, second_state, event)
state_machine.start("data")
exit_cb.assert_not_called()
entry_cb.assert_not_called()
state_machine.trigger_event(event, "data", propagate=True)
# no child fsm in current state, so the event is caught in this fsm
assert state_machine.current_state == second_state
def test_equality(self):
event1 = Event("event")
event2 = Event("event")
assert event1 == event2
def test_event_constructor(self):
event = Event("event")
assert event.name == "event"
