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try:
from builtins import object
except ImportError:
pass
from transitions import Machine
from unittest import TestCase
import gc
import weakref
import threading
class Dummy(object):
pass
class TestTransitionsAddRemove(TestCase):
def test_garbage_collection(self):
states = ['A', 'B', 'C', 'D', 'E', 'F']
machine = Machine(model=[], states=states, initial='A', name='Test Machine')
machine.add_transition('advance', 'A', 'B')
machine.add_transition('advance', 'B', 'C')
machine.add_transition('advance', 'C', 'D')
s1 = Dummy()
s2 = Dummy()
s2_collected = threading.Event()
s2_proxy = weakref.proxy(s2, lambda _: s2_collected.set())
machine.add_model([s1, s2])
self.assertTrue(s1.is_A())
self.assertTrue(s2.is_A())
s1.advance()
self.assertTrue(s1.is_B())
self.assertTrue(s2.is_A())
self.assertFalse(s2_collected.is_set())
machine.remove_model(s2)
del s2
gc.collect()
self.assertTrue(s2_collected.is_set())
s3 = Dummy()
machine.add_model(s3)
s3.advance()
s3.advance()
self.assertTrue(s3.is_C())
def test_add_model_initial_state(self):
states = ['A', 'B', 'C', 'D', 'E', 'F']
machine = Machine(model=[], states=states, initial='A', name='Test Machine')
machine.add_transition('advance', 'A', 'B')
machine.add_transition('advance', 'B', 'C')
machine.add_transition('advance', 'C', 'D')
s1 = Dummy()
s2 = Dummy()
s3 = Dummy()
machine.add_model(s1)
machine.add_model(s2, initial='B')
machine.add_model(s3, initial='C')
s1.advance()
s2.advance()
s3.advance()
self.assertTrue(s1.is_B())
self.assertTrue(s2.is_C())
self.assertTrue(s3.is_D())
def test_add_model_no_initial_state(self):
states = ['A', 'B', 'C', 'D', 'E', 'F']
machine = Machine(model=[], states=states, name='Test Machine', initial=None)
machine.add_transition('advance', 'A', 'B')
machine.add_transition('advance', 'B', 'C')
machine.add_transition('advance', 'C', 'D')
s1 = Dummy()
s2 = Dummy()
s3 = Dummy()
with self.assertRaises(ValueError):
machine.add_model(s1)
machine.add_model(s1, initial='A')
machine.add_model(s2, initial='B')
machine.add_model(s3, initial='C')
s1.advance()
s2.advance()
s3.advance()
self.assertTrue(s1.is_B())
self.assertTrue(s2.is_C())
self.assertTrue(s3.is_D())
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