def test_reset_at_begin(self):
i = utils.ResetableIterator([1, 2, 3])
iterator = iter(i)
i.reset()
i.reset()
self.assertEqual(1, next(iterator))
self.assertEqual(2, next(iterator))
self.assertEqual(3, next(iterator))
def test_no_reset_new_iterator(self):
i = utils.ResetableIterator([1, 2, 3])
iterator = iter(i)
self.assertEqual(1, next(iterator))
self.assertEqual(2, next(iterator))
iterator2 = iter(i)
self.assertEqual(3, next(iterator2))
def test_reset_after_end(self):
i = utils.ResetableIterator([1, 2, 3])
iterator = iter(i)
self.assertEqual(1, next(iterator))
self.assertEqual(2, next(iterator))
self.assertEqual(3, next(iterator))
self.assertRaises(StopIteration, next, iterator)
i.reset()
# Previous iter() has stopped
iterator = iter(i)
self.assertEqual(1, next(iterator))
self.assertEqual(2, next(iterator))
self.assertEqual(3, next(iterator))
def test_reset_shorter(self):
i = utils.ResetableIterator([1, 2, 3, 4, 5])
iterator = iter(i)
self.assertEqual(1, next(iterator))
self.assertEqual(2, next(iterator))
self.assertEqual(3, next(iterator))
self.assertEqual(4, next(iterator))
i.reset()
self.assertEqual(1, next(iterator))
self.assertEqual(2, next(iterator))
i.reset()
self.assertEqual(1, next(iterator))
self.assertEqual(2, next(iterator))
self.assertEqual(3, next(iterator))
self.assertEqual(4, next(iterator))
def test_infinite(self):
i = utils.ResetableIterator(itertools.cycle([1, 2, 3]))
iterator = iter(i)
values = [next(iterator) for _i in range(10)]
self.assertEqual([1, 2, 3, 1, 2, 3, 1, 2, 3, 1], values)
def test_no_reset(self):
i = utils.ResetableIterator([1, 2, 3])
self.assertEqual([1, 2, 3], list(i))