def test_swap_k_negative(self):
"""Test swap_k with negative k parameter."""
nums = [1, 7, 5, 9]
with self.assertRaises(ValueError):
swap_k(nums, -1)
def test_swap_k_high(self):
"""Test swap_k with k parameter which is higher than len(L) // 2."""
nums = [1, 7, 5, 9]
with self.assertRaises(ValueError):
swap_k(nums, 3)
def test_swap_k_small(self):
"""Test swap_k with k parameter which is 1."""
nums = [15, 4, 6, 98, 11, 4, 5]
nums_expected = [5, 4, 6, 98, 11, 4, 15]
swap_k(nums, 1)
self.assertEqual(nums, nums_expected)
def test_swap_k_bound(self):
"""Test swap_k with k parameter which is exactly len(L) // 2."""
nums = [15, 4, 6, 98, 11, 4, 5]
nums_expected = [11, 4, 5, 98, 15, 4, 6]
swap_k(nums, 3)
self.assertEqual(nums, nums_expected)
def test_swap_k_zero(self):
"""Test swap_k with zero k parameter."""
nums = [1, 3, 5, 78]
nums_expected = [1, 3, 5, 78]
swap_k(nums, 0)
self.assertEqual(nums, nums_expected)
def test_swap_k_one(self):
"""Test swap_k with a list with one element."""
nums = [9]
nums_expected = [9]
swap_k(nums, 0)
self.assertEqual(nums, nums_expected)
def test_swap_k_empty(self):
"""Test swap_k with empty list."""
nums = []
nums_expected = []
swap_k(nums, 0)
self.assertEqual(nums, nums_expected)