def test_1_item(self):
""" Test a single-item list -- smallest non-empty list and smallest list
with an odd number of items."""
L = [1]
L_expected = [1]
badswap.swap_k(L, 0)
self.assertEqual(L, L_expected)
def test_2_item(self):
""" Test swap on 2-item list -- the smallest list that actually be swapped, and
smallest list with an even number of items."""
L = [1, 2]
L_expected = [2, 1]
badswap.swap_k(L, 1)
self.assertEqual(L, L_expected)
def test_general_case_even(self):
""" Test a list with an even number of items, containing at least 4 items."""
L = [1, 2, 3, 4, 5, 6]
badswap.swap_k(L, 2)
L_expected = [5, 6, 3, 4, 1, 2]
self.assertEqual(L, L_expected)
def test_empty(self):
"""Test an empty list."""
L = []
L_expected = []
badswap.swap_k(L, 2)
self.assertEqual(L, L_expected)
def test_half_odd(self):
""" Test half an odd list -- i.e., k == len(list)//2."""
L = [1, 2, 3, 4, 5]
L_expected = [4, 5, 3, 1, 2]
badswap.swap_k(L, 2)
self.assertEqual(L, L_expected)
def test_half_even(self):
""" Test half an even list -- i.e., k == len(list)//2."""
L = [1, 2, 3, 4, 5, 6]
L_expected = [4, 5, 6, 1, 2, 3]
badswap.swap_k(L, 3)
self.assertEqual(L, L_expected)
def test_1_change(self):
"""Test smallest possible change -- i.e., k == 1."""
L = [1, 2, 3, 4, 5, 6]
L_expected = [6, 2, 3, 4, 5, 1]
badswap.swap_k(L, 1)
self.assertEqual(L, L_expected)
def test_no_change(self):
""" Test function when k == 0, i,e,, when the list is unchanged."""
L = [1, 2, 3, 4, 5, 6]
L_expected = [1, 2, 3, 4, 5, 6]
badswap.swap_k(L, 0)
self.assertEqual(L, L_expected)
def test_general_case_odd(self):
""" Test a list with an odd number of items, containing at least 5 items."""
L = [1, 2, 3, 4, 5, 6, 7]
badswap.swap_k(L, 2)
L_expected = [6, 7, 3, 4, 5, 1, 2]
self.assertEqual(L, L_expected)