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tests: Adding the example given on issue #308 as a doctest testcase
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‎tests/testcases/issue308.md‎

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### Issue 308
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A StateMachine that exercices the example given on issue
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#[308](https://github.com/fgmacedo/python-statemachine/issues/308).
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On this example, we share the transitions list between events.
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```py
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>>> from statemachine import StateMachine, State
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>>> class TestSM(StateMachine):
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... state1 = State('s1', initial=True)
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... state2 = State('s2')
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... state3 = State('s3')
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... state4 = State('s4', final=True)
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...
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... trans12 = state1.to(state2)
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... trans23 = state2.to(state3)
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... trans34 = state3.to(state4)
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...
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... # cycle = state1.to(state2) | state2.to(state3) | state3.to(state4)
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... cycle = trans12 | trans23 | trans34
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...
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... def before_cycle(self):
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... print("before cycle")
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...
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... def on_cycle(self):
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... print("on cycle")
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...
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... def after_cycle(self):
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... print("after cycle")
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...
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... def on_enter_state1(self):
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... print('enter state1')
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...
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... def on_exit_state1(self):
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... print('exit state1')
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...
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... def on_enter_state2(self):
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... print('enter state2')
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...
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... def on_exit_state2(self):
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... print('exit state2')
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...
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... def on_enter_state3(self):
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... print('enter state3')
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...
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... def on_exit_state3(self):
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... print('exit state3')
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...
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... def on_enter_state4(self):
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... print('enter state4')
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...
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... def on_exit_state4(self):
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... print('exit state4')
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...
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... def before_trans12(self):
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... print('before trans12')
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...
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... def on_trans12(self):
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... print('on trans12')
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...
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... def after_trans12(self):
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... print('after trans12')
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...
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... def before_trans23(self):
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... print('before trans23')
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...
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... def on_trans23(self):
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... print('on trans23')
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...
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... def after_trans23(self):
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... print('after trans23')
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...
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... def before_trans34(self):
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... print('before trans34')
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...
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... def on_trans34(self):
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... print('on trans34')
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...
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... def after_trans34(self):
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... print('after trans34')
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...
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```
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Example given:
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```py
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>>> m = TestSM()
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enter state1
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>>> m.is_state1, m.is_state2, m.is_state3, m.is_state4, m.current_state ; _ = m.cycle()
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(True, False, False, False, State('s1', id='state1', value='state1', initial=True, final=False))
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before cycle
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before trans12
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exit state1
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on cycle
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on trans12
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enter state2
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after cycle
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after trans12
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>>> m.is_state1, m.is_state2, m.is_state3, m.is_state4, m.current_state ; _ = m.cycle()
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(False, True, False, False, State('s2', id='state2', value='state2', initial=False, final=False))
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before cycle
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before trans23
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exit state2
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on cycle
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on trans23
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enter state3
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after cycle
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after trans23
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>>> m.is_state1, m.is_state2, m.is_state3, m.is_state4, m.current_state ; _ = m.cycle()
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(False, False, True, False, State('s3', id='state3', value='state3', initial=False, final=False))
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before cycle
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before trans34
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exit state3
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on cycle
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on trans34
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enter state4
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after cycle
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after trans34
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>>> m.is_state1, m.is_state2, m.is_state3, m.is_state4, m.current_state
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(False, False, False, True, State('s4', id='state4', value='state4', initial=False, final=True))
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```

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