def test_swap_elements(self):
lst = [1, 2, 3, 4]
swap_elements(lst, 1, 3)
self.assertEqual([1, 4, 3, 2], lst)
# TODO are there other DJEs???
def test_swap_elements_already_in_order_strings(self):
actual = swap_elements(['a', 'b', 'e', 'c'], 0)
expected = ['a', 'b', 'e', 'c']
self.assertEqual(expected, actual)
def test_swap_elements_lowest_next_to_index_numbers(self):
actual = swap_elements([2, 1, 4, 3], 0)
expected = [1, 2, 4, 3]
self.assertEqual(expected, actual)
def test_swap_elements_lowest_at_end_numbers(self):
actual = swap_elements([3, 2, 4, 1], 0)
expected = [1, 3, 4, 2]
self.assertEqual(expected, actual)
def test_swap_elements_already_in_order_numbers(self):
actual = swap_elements([1, 2, 4, 3], 0)
expected = [1, 2, 4, 3]
self.assertEqual(expected, actual)
def test_swap_elements_lowest_next_to_index_strings(self):
actual = swap_elements(['b', 'a', 'e', 'c'], 0)
expected = ['a', 'b', 'e', 'c']
self.assertEqual(expected, actual)
def test_swap_elements_lowest_at_end_strings(self):
actual = swap_elements(['z', 'b', 'e', 'a'], 0)
expected = ['a', 'z', 'e', 'b']
self.assertEqual(expected, actual)