def test_is_state_valid_with_invalid_states(self):
contains_negative_number = State(0, -1, 0)
more_cannibals_than_missionaries_on_wrong_side1 = State(1, 3, 0)
more_cannibals_than_missionaries_on_wrong_side2 = State(2, 3, 0)
more_cannibals_than_missionaries_on_wrong_side3 = State(1, 2, 0)
more_cannibals_than_missionaries_on_right_side1 = State(2, 1, 0)
more_cannibals_than_missionaries_on_right_side2 = State(1, 0, 0)
more_than_one_boat = State(3, 2, 2)
more_cannibals_than_initial_state = State(4, 3, 1)
more_missionaries_than_initial_state = State(3, 4, 1)
self.assertFalse(contains_negative_number.is_valid())
self.assertFalse(
more_cannibals_than_missionaries_on_wrong_side1.is_valid())
self.assertFalse(
more_cannibals_than_missionaries_on_wrong_side2.is_valid())
self.assertFalse(
more_cannibals_than_missionaries_on_wrong_side3.is_valid())
self.assertFalse(
more_cannibals_than_missionaries_on_right_side1.is_valid())
self.assertFalse(
more_cannibals_than_missionaries_on_right_side2.is_valid())
self.assertFalse(more_than_one_boat.is_valid())
self.assertFalse(more_cannibals_than_initial_state.is_valid())
self.assertFalse(more_missionaries_than_initial_state.is_valid())
def test_is_state_valid_with_valid_states(self):
more_missionaries_than_cannibals = State(3, 2, 0)
equal_number_of_missionaries_and_cannibals = State(2, 2, 0)
self.assertTrue(more_missionaries_than_cannibals.is_valid())
self.assertTrue(equal_number_of_missionaries_and_cannibals.is_valid())