def test_minheapify_OnRootExchanges(self):
arr = [0, 2, 4, 1]
dac.min_heapify(arr, 1)
expected = [0, 1, 4, 2]
self.assertEqual(expected, arr)
def test_minheapify_OnLeafDoesntExchange(self):
arr = [0, 1, 2, 3, 4, 5, 6]
dac.min_heapify(arr, 6)
expected = [0, 1, 2, 3, 4, 5, 6]
self.assertEqual(expected, arr)
